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Glacial dynamics and deglaciation history of Hambergbukta reconstructed from submarine landforms and sediment cores, SE Spitsbergen, Svalbard Boreas (IF 2.477) Pub Date : 2020-11-20 Riko Noormets; Anne Flink; Nina Kirchner
The submarine landforms and shallow sediment record are presented from Hambergbukta, southeastern Spitsbergen using swath‐bathymetric, subbottom acoustic, and sediment core data. The mapped landforms include large terminal and end‐moraines with associated debrisflow aprons on their distal flanks, drumlinized till surface, glacial lineations, medial and retreat moraines, crevasse squeeze ridge networks
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Climatic and environmental changes in the Yana Highlands of north‐eastern Siberia over the last c. 57 000 years, derived from a sediment core from Lake Emanda Boreas (IF 2.477) Pub Date : 2020-11-13 Marlene M. Baumer; Bernd Wagner; Hanno Meyer; Niklas Leicher; Matthias Lenz; Grigory Fedorov; Luidmila A. Pestryakova; Martin Melles
The sediment succession of Lake Emanda in the Yana Highlands was investigated to reconstruct the regional late Quaternary climate and environmental history. Hydro‐acoustic data obtained during a field campaign in 2017 show laminated sediments in the north‐western and deepest (up to ̃15 m) part of the lake, where a ̃6‐m‐long sediment core (Co1412) was retrieved. The sediment core was studied with a
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Mineral magnetism variables as potential indicators of permafrost aggradation and degradation at the southern edge of the permafrost zone, Northeast China Boreas (IF 2.477) Pub Date : 2021-01-12 Chenyi Zhu; Hongya Wang; Shuai Li; Yao Luo; Tianyi Xue; Yaqiong Song; An’an Qiu; Hongyan Liu
The northern Greater Khingan Range is located in northernmost Northeast China on the southern edge of the permafrost zone of the Northern Hemisphere. Isolated, sporadic and continuous permafrost belts are distributed from the southeast to the northwest in this area. Sixteen surface soil samples were collected from the three permafrost belts, and a 30‐cm‐deep soil profile was sampled from the continuous
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Impact of climate change on sedimentation processes in the eastern Gulf of Finland during the Middle to Late Holocene Boreas (IF 2.477) Pub Date : 2020-12-24 Daria V. Ryabchuk; Alexander Yu. Sergeev; Diana V. Prishchepenko; Vladimir A. Zhamoida; Daria V. Elkina; Alexey L. Piskarev; Leyla D. Bashirova; Ekaterina P. Ponomarenko; Leonid M. Budanov; Andrey G. Grigoriev; Anton V. Evdokimenko
This paper presents the results of high‐resolution sedimentological analyses of sediment cores from the eastern Gulf of Finland (Baltic Sea). Sampling sites in the periphery of sedimentary basins were selected on the basis of acoustic profiling analyses. The research allowed tracing of the transition from the freshwater Ancylus Lake to the Littorina Sea. A specific transitional layer of ‘blue clays’
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Prolonged interglacial warmth during the Last Glacial in northern Europe Boreas (IF 2.477) Pub Date : 2020-12-23 Karin F. Helmens; Christos Katrantsiotis; Niina Kuosmanen; Tomi P. Luoto; J. Sakari Salonen; Minna Väliranta
Few fossil‐based environmental and climate records in northern Europe are dated to Marine Isotope Stage (MIS) 5a around 80 ka BP. We here present multiple environmental and climate proxies obtained from a lake sequence of MIS 5a age in the Sokli basin (northern Finland). Pollen/spores, plant macrofossils, NPPs (e.g. green algae), bryozoa, diatoms and chironomids allowed an exceptionally detailed reconstruction
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10Be surface exposure dating of the deglaciation of northernmost Norway and Finland Boreas (IF 2.477) Pub Date : 2020-12-18 Johanna Anjar; Naki Akçar; Thomas Lakeman; Eiliv A. Larsen; Martin Seiler
During the Last Glacial Maximum, the coast of Finnmark county, northern Norway, was covered by the Scandinavian Ice Sheet (SIS), which coalesced with the Barents Sea Ice Sheet (BSIS) off the coast. The region is thus important for our understanding of the dynamic interactions between the BSIS and the SIS, yet it remains one of the least dated regions covered by the SIS. To improve the chronological
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Ecological conditions during the Middle to Upper Palaeolithic transition (MIS 3) in Iberia: the cold‐adapted faunal remains from Mainea, northern Iberian Peninsula Boreas (IF 2.477) Pub Date : 2020-12-17 Manuel Rodríguez‐Almagro; Nohemi Sala; Christoph Wiβing; Martin Arriolabengoa; Francisco Etxeberria; Joseba Rios‐Garaizar; Asier Gómez‐Olivencia
Cold‐adapted faunal populations shifted southwards during the coldest episodes of the Middle and Late Pleistocene, reaching the Iberian Peninsula. In this context, some of these species, such as Coelodonta antiquitatis and Mammuthus primigenius extended throughout the territory, leaving evidence in, at least, 35 and 29 sites, respectively; however, in most cases, the evidence is scarce. Here we present
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High‐resolution mollusc record from the Mituchovci tufa (western Slovakia): a reference for the Holocene succession of Western Carpathian mid‐elevation forests Boreas (IF 2.477) Pub Date : 2020-12-16 Jitka Frodlová; Michal Horsák
The Western Carpathian Mountains have been attracting palaeoecologists for a long time, recently mainly to seek direct evidence of northern cryptic refugia in this region. We investigated a rich Holocene mollusc record in the White Carpathian Mountains, capturing a gradual development of forest malacofaunas under stable environmental conditions. To obtain precise data about colonization and extinction
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New insights into lake responses to rapid climate change: the Younger Dryas in Lake Gościąż, central Poland Boreas (IF 2.477) Pub Date : 2020-12-16 Daniela Müller; Rik Tjallingii; Mateusz Płóciennik; Tomi P. Luoto; Bartosz Kotrys; Birgit Plessen; Arne Ramisch; Markus J. Schwab; Mirosław Błaszkiewicz; Michał Słowiński; Achim Brauer
The sediment profile from Lake Gościąż in central Poland comprises a continuous, seasonally resolved and exceptionally well‐preserved archive of the Younger Dryas (YD) climate variation. This provides a unique opportunity for detailed investigation of lake system responses during periods of rapid climate cooling (YD onset) and warming (YD termination). The new varve record of Lake Gościąż presented
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Deglaciation dynamics of the Scandinavian Ice Sheet in the Salpausselkä zone, southern Finland Boreas (IF 2.477) Pub Date : 2020-12-16 Juha P. Lunkka; Jukka‐Pekka Palmu; Anu Seppänen
Deglaciation patterns of the Scandinavian Ice Sheet in the Salpausselkä zone, southern Finland were studied. Digital elevation models (DEM/LiDAR‐imageries) were used to map and categorize glacifluvial formations of the study area, and evidence for ice re‐advance and retreat phases and their extent across the Younger Dryas Salpausselkä zone was collected. The results suggest that the Finnish Lake District
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Late Holocene environmental and climatic changes in the Western Sayan Mountains based on high‐resolution multi‐proxy data Boreas (IF 2.477) Pub Date : 2020-12-13 Tatiana Blyakharchuk; Irina Kurina
Southern Siberia is characterized by complex climatic and vegetation patterns, and the late‐Quaternary evolution of climate and vegetation in this vast region is still poorly understood. This study uses pollen, spores, testate amoebae and plant macrofossils to characterize environmental and climatic changes at Bezrybnoe Mire (Western Sayan Mountains, southern Central Siberia). Pollen data indicate
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Millennial‐scale environmental changes in the northwestern Japan Sea during the last glacial cycle Boreas (IF 2.477) Pub Date : 2020-12-13 Tatiana A. Evstigneeva; Marina V. Cherepanova; Sergey A. Gorbarenko; Xuefa Shi; Alexander A. Bosin; Igor V. Utkin
High‐resolution analyses of pollen and diatoms in core LV 53‐29 from the northwestern Japan Sea trace climate, vegetation and oceanographic changes during the past 120 ka. The age model for the core was based on tephrochronology, colour lightness and magnetic susceptibility and was used to aid correlation with Dansgaard‐Oeschger cycles (warm Greenland interstadials (GIs) and cold Greenland stadials
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Lake development and vegetation history in coastal Primor'ye: implications for Holocene climate of the southeastern Russian Far East Boreas (IF 2.477) Pub Date : 2020-12-12 Anatoly V. Lozhkin; Patricia M. Anderson; Thomas A. Brown; Tatiana A. Grebennikova; Julia A. Korzun; Valeriya I. Tsigankova
Latvia Lake provides one of the few high‐resolution palaeoenvironmental records from southeastern Primor'ye. It traces basin, vegetation and climate histories over the past c. 8.6 ka. The Latvia basin experienced four phases, two of which involved frequent shifts amongst lake, lagoon and bay settings (c. 8.6–7.0 cal. ka BP and c. 2.1 cal. ka BP–present). A sandbar was present between c. 7.0 and 6.9 cal
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The influence of Holocene forest dynamics on the chironomid fauna of a boreal lake (Flocktjärn, northeast Sweden) Boreas (IF 2.477) Pub Date : 2020-12-07 Stefan Engels
There is a notable lack of palaeoecological records, particularly quantitative palaeoenvironmental reconstructions, for northeast Sweden. Here I use a lake sediment record from lake Flocktjärn to reconstruct Holocene terrestrial vegetation change and lake ecosystem dynamics, and to study the relationship between these components of the environment. After a period in which the vegetation around the
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Deglaciation dynamics of the Fennoscandian Ice Sheet in the Kattegat, the gateway between the North Sea and the Baltic Sea Basin Boreas (IF 2.477) Pub Date : 2020-12-02 Outi Hyttinen; Nadina Quintana Krupinski; Ole Bennike; Lukas Wacker; Helena L. Filipsson; Stephen Obrochta; Jørn B. Jensen; Bryan Lougheed; Daria Ryabchuk; Sandra Passchier; Ian Snowball; Emilio Herrero‐Bervera; Thomas Andrén; Aarno T. Kotilainen
This paper presents an age–depth model based on an ultra‐high‐resolution, 80‐m‐thick sedimentary succession from a marine continental shelf basin, the Kattegat. This is an area of dynamic deglaciation of the Fennoscandian Ice Sheet during the Late Pleistocene. The Kattegat is also a transitional area between the saline North Sea and the brackish Baltic Sea. As such, it records general development of
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Pleistocene freshwater environments of Poland: a comprehensive study of fish assemblages based on a multi‐proxy approach Boreas (IF 2.477) Pub Date : 2020-11-20 Krzysztof Stefaniak; Oleksandr Kovalchuk; Jan Kotusz; Renata Stachowicz‐Rybka; Joanna Mirosław‐Grabowska; Hanna Winter; Monika Niska; Artur Sobczyk; Zoltán Barkaszi; Adam Kotowski; Małgorzata Malkiewicz; Witold Paweł Alexandrowicz; Paweł Raczyński; Janusz Badura; Bogusław Przybylski; Dariusz Ciszek; Krzysztof Urbański
The results of a comprehensive study of Pleistocene fish‐bearing localities from the territory of Poland are presented. Fish remains came from lacustrine deposits and cave sites representing a time‐span from the late Early Pleistocene until the Early Holocene. Here we present the taxonomic composition and species diversity of all known fish assemblages from Poland. In total, 23 species belonging to
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A 725‐year integrated offshore terrestrial varve chronology for southeastern Sweden suggests rapid ice retreat ~15 ka BP Boreas (IF 2.477) Pub Date : 2020-11-17 Rachael S. Avery; Sarah L. Greenwood; Frederik Schenk; Björn M. Morén; David I. Armstrong Mckay; Lars Brunnberg; Barbara Wohlfarth
The Swedish Varve Chronology is an unparalleled tool for linking the deglacial history of Sweden with associated palaeo‐environmental change at an annual time scale, and it forms part of Sweden's cultural heritage. A full deglacial chronology connected to the present day does not yet exist; a notable gap is in southeasternmost Sweden, where few varved records are successfully connected to reconstruct
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Shallow depositional basins as potential archives of palaeoenvironmental changes in southwestern Greenland over the last 800 years Boreas (IF 2.477) Pub Date : 2020-11-08 Matěj Roman; Barbora Chattová; Jiří Lehejček; Václav Tejnecký; Daniel Vondrák; Petra Luláková; Karel Němeček; Jakub Houška; Ondřej Drábek; Daniel Nývlt
The Arctic, one of the most sensitive components of the Earth's climate system, experienced pronounced climatic fluctuations during the Late Holocene. In order to obtain a detailed record of past environmental and climatic variability, sedimentary cores from two interconnected infilled depositional basins in the Kobbefjord area, southwestern Greenland, were retrieved and subjected to a multi‐proxy
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Meadow, marsh and lagoon: Late Holocene coastal changes and human–environment interactions in northern Denmark Boreas (IF 2.477) Pub Date : 2020-11-08 Søren M. Kristiansen; Thomas E. Ljungberg; Torben Trier Christiansen; Kristian Dalsgaard; Niels Haue; Mogens H. Greve; Bjarne Henning Nielsen
This paper presents a study of past coastline dynamics and their consequences for prehistoric societies living in the glacio‐isostatically uplifted central Limfjord area, northern Denmark. The consequences of the gradual relative sea level (RSL) changes have been investigated to develop a local RSL curve, study settlement patterns on newly exposed marine foreland, and estimate changes in the area and
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A new map of glacigenic features and glacial landsystems in central mainland Nunavut, Canada Boreas (IF 2.477) Pub Date : 2020-11-06 Isabelle McMartin; Pierre‐Marc Godbout; Janet E. Campbell; Tommy Tremblay; Pouran Behnia
A new digital map of glacial geomorphic features and interpreted glacial landsystems was produced for an area covering ~415 000 km2 in the Keewatin Sector of the Laurentide Ice Sheet (LIS) in Nunavut. The map integrates information from previous surficial geology maps and >14 000 field stations, and is significantly improved by the detailed inventory of ~152 000 glacigenic features using high‐resolution
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The discovery of the Younger Dryas, and comments on the current meaning and usage of the term Boreas (IF 2.477) Pub Date : 2020-11-04 Jan Mangerud
The Younger Dryas (YD) cold event was discovered in Denmark by Hartz and Mithers in 1904 and the term coined by Hartz in 1912. It was identified as a lacustrine clay bed containing plant macrofossils of an Arctic flora, including Dryas octopetala, and lying between Allerød and Holocene gyttjas containing a warmer flora with birch trees. The YD is unique in the sense that it is the largest and most
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Contrasting modes of deglaciation between fjords and inter‐fjord areas in eastern North Greenland Boreas (IF 2.477) Pub Date : 2020-10-06 Nicolaj K. Larsen; Anne Sofie Søndergaard; Laura B. Levy; Jesper Olsen; Astrid Strunk; Anders A. Bjørk; Daniel Skov
Knowledge about the deglaciation history of the Greenland Ice Sheet (GrIS) is important to put the recent observations of ice loss into a longer‐term perspective. In southern Greenland, the deglaciation history is generally well constrained. In this study, we use 43 new 10Be surface exposure ages combined with existing minimum‐limiting 14C ages to constrain the deglaciation history of eastern North
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Geomorphic response to the Lateglacial–Holocene transition in high Alpine regions (Sanetsch Pass, Swiss Alps) Boreas (IF 2.477) Pub Date : 2020-10-29 Elena Serra; Pierre G. Valla; Natacha Gribenski; Fabio Guedes Magrani; Julien Carcaillet; Reynald Delaloye; Bernard Grobéty; Luc Braillard
Several palaeoclimatic archives have documented the pronounced climatic and environmental change associated with the Lateglacial–Holocene transition in the European Alps. However, the geomorphic response to this major environmental transition has only been punctually investigated. In this study, we propose a detailed reconstruction of post‐Last Glacial Maximum palaeoenvironmental conditions and geomorphic
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Loess deposits in the Tajik Basin, Central Asia: chronology, provenance and palaeoclimatic implications since the Last Glacial Boreas (IF 2.477) Pub Date : 2020-10-27 Shengchen Tian; Jimin Sun; Zhiliang Zhang; Sherzod Abdulov; Mengmeng Cao; Mustafo Gadoev; Ilhomjon Oimahmadov
The thick loess deposits in Tajikistan are important archives for palaeoclimatic reconstruction in Central Asia during the Quaternary. To date however, adequate high‐resolution studies of chronology and climatic evolution of the Tajik loess have still not been carried out. In this paper, chronology, dust provenance, and palaeoclimatic significance of a loess section in the centre of the Tajik Basin
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The last glaciation of the Arctic volcanic island Jan Mayen Boreas (IF 2.477) Pub Date : 2020-10-25 Astrid Lyså; Eiliv A. Larsen; Johanna Anjar; Naki Akçar; Morgan Ganerød; Asbjørn Hiksdal; Roelant Van Der Lelij; Christof Vockenhuber
The volcanic island of Jan Mayen, remotely located in the Norwegian‐Greenland Sea, was covered by a contiguous ice cap during the Late Weichselian. Until now, it has been disputed whether parts of the island south of the presently glaciated Mount Beerenberg area were ever glaciated. Based on extensive field mapping we demonstrate that an ice cap covered all land areas and likely also extended onto
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First reliable chronology for the Early Khvalynian Caspian Sea transgression in the Lower Volga River valley Boreas (IF 2.477) Pub Date : 2020-10-23 Redzhep Kurbanov; Andrew Murray; Warren Thompson; Mikhail Svistunov; Natalia Taratunina; Tamara Yanina
During the late Quaternary, dramatic changes in relative sea level (~170 m) are known to have occurred in the Caspian Sea. However, all previous attempts at resolving the uncertainty associated with the timing of these transgressive/regressive events, primarily using radiocarbon, have produced inconclusive or controversial results. Here we present the first reliable chronology for the largest known
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High‐resolution stratigraphy of Quaternary fluvial deposits in the Makó Trough and the Danube‐Tisza Interfluve, Hungary, based on magnetic susceptibility data Boreas (IF 2.477) Pub Date : 2020-10-07 Zoltán Püspöki; Tímea Fogarassy‐Pummer; Edit Thamó‐Bozsó; György Falus; Ágnes Cserkész‐Nagy; Bálint Szappanos; Emő Márton; Zoltán Lantos; Szilárd Szabó; Ferenc Stercel; Ágnes Tóth‐Makk; Richard W. Mcintosh; Teodóra Szőcs; Péter Pálóczy; Tamás Fancsik
High‐resolution stratigraphical architecture of a Quaternary fluvial succession in the Makó Trough and the Danube‐Tisza Interfluve (Pannonian Basin, Hungary) was investigated based on low field magnetic susceptibility (MS) measurements of seven fully cored boreholes, interpreted on the basis of the early postglacial magnetic susceptibility episodes previously described in the Körös and Jászság Basins
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Middle to Late Pleistocene environments based on stable organic carbon and nitrogen isotopes of loess‐palaeosol sequences from the Carpathian Basin Boreas (IF 2.477) Pub Date : 2020-10-06 Stephan Pötter; Arndt Schmitz; Andreas Lücke; Philipp Schulte; Igor Obreht; Michael Zech; Holger Wissel; Slobodan B. Marković; Frank Lehmkuhl
Stable organic carbon and nitrogen isotopes can be used to interpret past vegetation patterns and ecosystem qualities. Here we present these proxies for two loess‐palaeosol sequences from the southern Carpathian Basin to reconstruct the palaeoenvironment during the past 350 ka and establish regional commonalities and differences. Before now, isotopic studies on loess sequences from this region were
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Palaeoenvironmental conditions during MIS 6/MIS 5 transition recorded in speleothems from the Tatra Mountains Boreas (IF 2.477) Pub Date : 2020-09-28 Jacek Pawlak; Marcin Błaszczyk; Helena Hercman; Šárka Matoušková
We present 100‐ka multiproxy palaeoenvironmental records from three stalagmites collected in different caves located in the Tatra Mountains on the Polish/Slovakian border. A combination of three records from one mountain region helps to estimate local factors controlling the recorded proxies and separate them from regional/global patterns. The studied stalagmites react to the same environmental changes
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Quartz OSL chronology of the loess deposits in the Western Qinling Mountains, China, and their palaeoenvironmental implications since the Last Glacial period Boreas (IF 2.477) Pub Date : 2020-09-25 Shengli Yang; Nannan Liu; Dongxue Li; Ting Cheng; Weiming Liu; Shuai Li; Hui Chen; Li Liu; Yuanlong Luo
Extensive loess deposits exist in the Western Qinling Mountains (WQM), which constitute the transition zone between the Tibetan Plateau and the Chinese Loess Plateau (CLP). These deposits are one of the most important terrestrial archives regarding past dust activity and environmental changes in East Asia; however, they remain insufficiently known and poorly understood. Herein, we conducted detailed
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Climatic structures and intensities of the last two glacials documented by terrestrial molluscs from Chinese loess sequences Boreas (IF 2.477) Pub Date : 2020-09-25 Dan Zhang; Nai‐Qin Wu; Feng‐Jiang Li; Denis‐Didier Rousseau; Xiao‐Yun Chen; Ya‐Jie Dong; Hou‐Yuan Lu
Knowledge of the structures and intensities of past glaciations is crucial for understanding Quaternary palaeoclimatic evolution. Terrestrial molluscs are a reliable proxy of past environmental conditions and can provide specific climatic insights into glacials. Here we compare the climatic evolution of the last two glacials, based on mollusc fossils from the L2 and L1 loess units (equivalent to Marine
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Lateglacial and Holocene environmental history of the central Kola region, northwestern Russia revealed by a sediment succession from Lake Imandra Boreas (IF 2.477) Pub Date : 2020-09-22 Matthias Lenz; Larisa Savelieva; Larisa Frolova; Anna Cherezova; Matthias Moros; Marlene M. Baumer; Raphael Gromig; Natalia Kostromina; Niyaz Nigmatullin; Vasili Kolka; Benrd Wagner; Grigory Fedorov; Martin Melles
Bolshaya Imandra, the northern sub‐basin of Lake Imandra, was investigated by a hydro‐acoustic survey followed by sediment coring down to the acoustic basement. The sediment record was analysed by a combined physical, biogeochemical, sedimentological, granulometrical and micropalaeontological approach to reconstruct the regional climatic and environmental history. Chronological control was obtained
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Limnological response to the Laacher See eruption (LSE) in an annually laminated Allerød sediment sequence from the Nahe palaeolake, northern Germany Boreas (IF 2.477) Pub Date : 2020-09-21 Stefan Dreibrodt; Sascha Krüger; Jan Weber; Ingo Feeser
This paper presents evidence for a limnological response to the Laacher See eruption (LSE) as detected in lake sediments from Nahe, northern Germany. The sediment section of the Allerød period dating to between 13 422 and 12 708 cal. a BP is preserved in annual laminations. Within this section, the LSE was identified as a cryptotephra layer (12 944±44 cal. a BP). Microfacies analysis, continuous high‐resolution
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First records of contemporary testate amoeba assemblages from the Kamchatka Peninsula, Russia and potential for palaeoenvironmental reconstruction Boreas (IF 2.477) Pub Date : 2020-08-10 Richard J. Payne; Anatoly A. Bobrov; Andrey N. Tsyganov; Kirill V. Babeshko; Thomas J. Sloan; Martin Kay; Dmitry A. Kupriyanov; Nikolay V. Surkov; Elena Y. Novenko; Andrey A. Andreev; Yuri A. Mazei
The Kamchatka Peninsula in the far east of Russia is a substantial landmass that is poorly documented in terms of most elements of biodiversity. Here we provide the first study of modern assemblages of testate amoebae, a widespread group of protists that are particularly abundant in soils. We present a data set of 78 widely distributed samples, including forest, fen, scrub and bog habitats. Testate
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Salt‐induced crestal faults control the formation of Quaternary tunnel valleys in the southern North Sea Boreas (IF 2.477) Pub Date : 2020-08-10 Stefan Wenau; Tiago M. Alves
Tunnel valleys are major features of glaciated margins and they enable meltwater expulsion from underneath a thick ice cover. Their formation is related to the erosion of subglacial sediments by overpressured meltwater and direct glacial erosion. Yet, the impact of pre‐existing structures on their formation and morphology remains poorly known. High‐quality 3D seismic data allowed the mapping of a large
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Middle and Late Holocene altitudinal distribution limit changes of Fagus crenata forest, Mt. Kurikoma, Japan indicated by stomatal evidence Boreas (IF 2.477) Pub Date : 2020-08-06 Yuqing Wang; Arata Momohara; Nobuhiko Wakamatsu; Takayuki Omori; Minoru Yoneda; Mo Yang
This study proposes a new method to detect changes of altitudinal distribution limit of a plant species based on the stomatal analysis of fossilized leaves. We use the Holocene fossil leaves of Fagus crenata (Japanese beech), a dominant deciduous tree in the cool temperate zone, from different horizons in a peat bog in Mt. Kurikoma, north Japan. Results of palaeo‐CO2 concentration reconstructed from
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Lake Baikal highstand during MIS 3 recorded by palaeo‐shorelines on Bolshoi Ushkanii Island Boreas (IF 2.477) Pub Date : 2020-08-04 Sergey Arzhannikov; Anastasia Arzhannikova; Alexei Ivanov; Elena Demonterova; Alena Yakhnenko; Victor Gorovoy; John Jansen
The debate regarding the history of water‐level fluctuations in Lake Baikal extends back to the late 19th century and is rooted in the interpretation of the sequence of palaeo‐shoreline terraces observed around the Baikal trough. Modern studies identify terraces up to 200 m above and down to 40 m below the present‐day Lake Baikal water level, and opinions are split between (i) those who regard the
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Plio‐Pleistocene fault reactivation within the Crag Basin, eastern UK: implications for structural controls of landscape development within an intraplate setting Boreas (IF 2.477) Pub Date : 2020-07-30 Jonathan R. Lee; Richard Haslam; Mark A. Woods; James Rose; Romaine L. Graham; Jonathan R. Ford; David I. Schofield; Timothy I. Kearsey; Christopher N. Williams
This study examines the long‐term neotectonic evolution of the Crag Basin of eastern England during the Plio‐Pleistocene (c. 4.0–0.48 Ma) and the influence of neotectonics on coastal and drainage development. The Crag Basin was situated within the western margins of the southern North Sea with palaeogeography influenced by changes in global sea‐level and longer‐term regional‐scale neotectonic uplift
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Quantitative analyses of cirques on the Faroe Islands: evidence for time transgressive glacier occupation Boreas (IF 2.477) Pub Date : 2020-07-26 Keyleigh N. Wallick; Sarah M. Principato
This study presents the first analysis of ice‐free cirques on the Faroe Islands using a Geographical Information System (GIS) and the Automated Cirque Metric Extraction (ACME) tool. The length, width, area, circularity, mean aspect, mean slope, and elevation range, minimum, and maximum were calculated using ACME. Cirque distance to coastline was measured using ArcGIS. A total of 116 cirques were identified
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A post‐IR IRSL chronology and dust mass accumulation rates of the Nosak loess‐palaeosol sequence in northeastern Serbia Boreas (IF 2.477) Pub Date : 2020-07-23 Zoran M. Perić; Slobodan B. Marković; György Sipos; Milivoj B. Gavrilov; Christine Thiel; Christian Zeeden; Andrew S. Murray
In the Middle Danube Basin, Quaternary deposits are widely distributed in the Vojvodina region where they cover about 95% of the area. Major research during the last two decades has been focused on loess deposits in the Vojvodina region. During this period, loess in the Vojvodina region has become one of the most important Pleistocene European continental climatic and environmental records. Here we
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Holocene alluvial fan evolution, Schmidt‐hammer exposure‐age dating and paraglacial debris floods in the SE Jostedalsbreen region, southern Norway Boreas (IF 2.477) Pub Date : 2020-07-23 John A. Matthews; Lindsey J. McEwen; Geraint Owen; Sietse Los
The evolution of several sub‐alpine alluvial fans SE of the Jostedalsbreen ice cap was investigated based on their geomorphology and Schmidt‐hammer exposure‐age dating (SHD) applied to 47 boulder deposits on the fan surfaces. A debris‐flood rather than debrisflow or water‐flow origin for the deposits was inferred from their morphology, consisting of low ridges with terminal splays up to 100 m wide
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Brecciation of glacially overridden palaeokarst (Lower Aare Valley, northern Switzerland): result of subglacial water‐pressure peaks? Boreas (IF 2.477) Pub Date : 2020-07-22 Lukas Gegg; Marius W. Buechi; Andreas Ebert; Gaudenz Deplazes; Herfried Madritsch; Flavio S. Anselmetti
Water pressures at the base of active glacial overdeepenings are known to fluctuate strongly on various time scales. Rapid peaks in basal water pressure can lead to fracturing of the glacier bed, a process that has been described at numerous sites around the world, mostly based on large hydrofracture systems. This article presents drill‐cores from the base of a >100‐m‐deep glacial overdeepening in
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Mountain glacier fluctuations during the Lateglacial and Holocene on Clavering Island (northeastern Greenland) from 10Be moraine dating Boreas (IF 2.477) Pub Date : 2020-07-22 Melody Biette; Vincent Jomelli; Marie Chenet; Régis Braucher; Vincent Rinterknecht; Timothy Lane;
Despite an increasing interest in Greenlandic mountain glaciers over recent decades, their evolution during the Lateglacial and Holocene still needs to be better constrained. Here we present 25 10Be cosmic‐ray exposure (CRE) ages of boulders collected on moraines from three glaciers located on Clavering Island (northeastern Greenland). CRE ages span 16.29±0.79 to 0.37±0.05 ka and reveal three periods
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The Late Pleistocene–Early Holocene palaeoenvironmental evolution in the SE Baltic region: a new approach based on chironomid, geochemical and isotopic data from Kamyshovoye Lake, Russia Boreas (IF 2.477) Pub Date : 2020-07-11 Olga Druzhinina, Yuriy Kublitskiy, Miglė Stančikaitė, Larisa Nazarova, Liudmila Syrykh, Laura Gedminienė, Domas Uogintas, Raminta Skipityte, Khikmatulla Arslanov, Giedrė Vaikutienė, Marianna Kulkova, Dmitry Subetto
The Kamyshovoye Lake sedimentary record in the southeastern Baltic Sea region was studied to reconstruct climatic fluctuations and the abiotic responses to them during the Lateglacial and Early Holocene. New results from chironomid, isotopic, palaeomagnetic and geochemical data analyses were correlated with earlier evidence of lithological and palynological changes in the Kamyshovoye Lake record. The
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Preservation of common soil phytoliths in the northern temperate region: a case study from northeast China Boreas (IF 2.477) Pub Date : 2020-07-11 Li‐Dan Liu; Dong‐Mei Jie; Hong‐Yan Liu; Gui‐Zai Gao; De‐Hui Li; Nan‐Nan Li
We investigated the phytolith assemblage characteristics and preservation of soil phytoliths in nine soil types at 83 sites in northeast China. The results indicate that the phytolith assemblages from the nine soils are similar, particularly in terms of the content of the dominant short cell phytoliths, and elongate and lanceolate phytoliths. The phytolith indexes of aridity and water stress (Iph and
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Holocene relative shore level changes and Stone Age hunter‐gatherers in Hiiumaa Island, eastern Baltic Sea Boreas (IF 2.477) Pub Date : 2020-06-29 Alar Rosentau; Triine Nirgi; Merle Muru; Stefan Bjursäter; Tiit Hang; Frank Preusser; Jan Risberg; Kadri Sohar; Hannes Tõnisson; Aivar Kriiska
Holocene relative shore level (RSL) changes and Stone Age palaeogeography of Hiiumaa Island are reconstructed using airborne LiDAR elevation data, sedimentological and archaeological proxies as well as GIS‐based landscape modelling. Altogether, 38 RSL index and limiting points are used in modelling and presented in the current paper. The highest raised shorelines of the Ancylus Lake and Litorina Sea
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Revision of the occurrence of muskox (Ovibos moschatus Zimmermann 1780) from the Gravettian of Arbreda Cave (Serinyà, northeastern Iberian Peninsula): new insights for the study of Iberian cold‐adapted faunas Boreas (IF 2.477) Pub Date : 2020-06-29 Isaac Rufí; Dorothée G. Drucker; Hervé Bocherens; Lluís Lloveras; Joan Madurell‐Malapeira; Julià Maroto; Joaquim Soler; Narcís Soler
During the Last Glacial cycle (MIS 4 to MIS 2), the isthmic Pyrenees mountain range acted as a biogeographical barrier, effectively restricting faunal exchanges to its western and eastern terminations. The study of the composition of megaherbivore communities has revealed the transitional character of the Cantabrian region (northwest Iberian Peninsula) during the MIS 3, between western European cold
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Individual event, seasonal and interannual variations in δ18O values of drip water in Maomaotou Big Cave, Guilin, South China, and their implications for palaeoclimatic reconstructions Boreas (IF 2.477) Pub Date : 2020-06-24 Jian‐Jun Yin; Wei Tang; Xia Wu; Junbing Pu; Xiaoyan Zhu; Zhijun Wang; Gaoyong Lan; Hui Yang
Accurately interpreting the stable oxygen isotopic composition (δ18O) of cave drip water is critical to the retrieval of palaeoclimatic information based on the δ18O records preserved in speleothem calcite. Substantial cave monitoring data sites of interest can make essential contributions. In this study, six speleothem drip water sites and one pool water site were selected for a five‐year (2013–2017)
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The Late Saalian Cyprina clay of northeastern Germany and the following Weichselian sedimentation and deformation history – Review and new data Boreas (IF 2.477) Pub Date : 2020-06-02 Karsten Obst, Jörg Ansorge, Christine Thiel, Peter Frenzel
Glacially dislocated fossiliferous clay – hitherto called Cyprina clay– and associated Pleistocene sediments are exposed at the northeastern German coast. They were uplifted as glacial rafts from a position of about 30 m below the sea level and incorporated into glaciotectonic complexes of Dornbusch (Hiddensee), Arkona (Rügen) and Greifswalder Oie during the ice advances of the Last Glacial Maximum
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The deglaciation of the western sector of the Irish Ice Sheet from the inner continental shelf to its terrestrial margin Boreas (IF 2.477) Pub Date : 2020-06-01 David H. Roberts, Colm Ó Cofaigh, Colin K. Ballantyne, Matthew Burke, Richard C. Chiverrell, David J. A. Evans, Chris D. Clark, Geoff A. T. Duller, Jeremy Ely, Derek Fabel, David Small, Rachel K. Smedley, S. Louise Callard
This paper provides a new deglacial chronology for retreat of the Irish Ice Sheet from the continental shelf of western Ireland to the adjoining coastline, a region where the timing and drivers of ice recession have never been fully constrained. Previous work suggests maximum ice‐sheet extent on the outer western continental shelf occurred at ~26–24 cal. ka BP with the initial retreat of the ice marked
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A reconsideration of the radiocarbon dating of the Marine Isotope Stage 3 fauna from southern Ireland Boreas (IF 2.477) Pub Date : 2020-06-01 Ruth F. Carden, Thomas F. G. Higham, Peter C. Woodman
With the improvements in the techniques of radiocarbon dating since the 1990s and the pretreatment of bone samples, it has become apparent that some of the radiocarbon dates from Irish caves such as Castlepook Cave may not be as accurate as previously determined. The faunal remains and sediments within Castlepook Cave are important as this cave is one of only two caves in Ireland in which both pre‐
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Environmental conditions at the Last Interglacial (Eemian) site Neumark‐Nord 2, Germany inferred from stable isotope analysis of freshwater mollusc opercula Boreas (IF 2.477) Pub Date : 2020-06-01 Stefania Milano, Eduard Pop, Wim Kuijper, Wil Roebroeks, Sabine Gaudzinski‐Windheuser, Kirsty Penkman, Lutz Kindler, Kate Britton
Mollusc biogenic carbonates are valuable records of past environmental conditions. In particular, carbonate oxygen (δ18O) and carbon (δ13C) stable isotopes can be used to reconstruct different physical and chemical parameters, according to the different genera used (marine, freshwater or terrestrial). The Last Interglacial (early Eemian) palaeolake of Neumark‐Nord 2 (NN2), Germany provides an excellent
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Rapid Late Pleistocene climate change reconstructed from a lacustrine ostracod record in central Italy (Lake Trasimeno, Umbria) Boreas (IF 2.477) Pub Date : 2020-06-01 Marta Marchegiano; David J. Horne; Elsa Gliozzi; Alexander Francke; Bernd Wagner; Daniel Ariztegui
This study presents, for the first time, a detailed quantitative reconstruction of winter (January) and summer (July) palaeotemperatures from the Late Pleistocene to Holocene transition in central Italy based on ostracod assemblages in an 8.59‐m‐long sediment core retrieved in Lake Trasimeno. Of 19 ostracod species recovered, 13 were calibrated according to their living temperature ranges, enabling
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Morphometry of lower cheek teeth of cave bears (Carnivora, Ursidae) and general remarks on the dentition variability Boreas (IF 2.477) Pub Date : 2020-06-01 Gennady F. Baryshnikov, Andrey Y. Puzachenko
The variability of lower 6776 cheek teeth of spelaeoid (Ursus spelaeus, U. kanivetz, U. deningeri, U. kudarensis, U. savini and U. rossicus) and arctoid lineages (extant and extinct U. arctos) recovered from 176 palaeontological localities was analysed by methods of univariate and multivariate statistics. For comparison, teeth of U. minimus and U. etruscus species, which are ancestral taxa for cave
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Re‐analysis of late Quaternary dust mass accumulation rates in Serbia using new luminescence chronology for loess–palaeosol sequence at Surduk Boreas (IF 2.477) Pub Date : 2020-05-25 Kaja Fenn, Julie A. Durcan, David S. G. Thomas, Ian L. Millar, Slobodan B. Marković
Despite numerous palaeoenvironmental investigations of loess–palaeosol sequences across the Carpathian Basin, well‐dated high‐resolution records are scarce. This paper presents a new high‐resolution chronology for the loess‐palaeosol sequence at Surduk (Serbia), based on optically stimulated luminescence (quartz) and post‐infrared infrared stimulated luminescence (polymineral) dating. The presented
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Sedimentary biomarkers reaffirm human impacts on northern Beringian ecosystems during the Last Glacial period Boreas (IF 2.477) Pub Date : 2020-05-20 Richard S. Vachula, Yongsong Huang, James M. Russell, Mark B. Abbott, Matthew S. Finkenbinder, Jonathan A. O'Donnell
Our understanding of the timing of human arrival to the Americas remains fragmented, despite decades of active research and debate. Genetic research has recently led to the ‘Beringian standstill hypothesis’ (BSH), which suggests an isolated group of humans lived somewhere in Beringia for millennia during the Last Glacial, before a subgroup migrated southward into the American continents about 14 ka
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Subfossil oribatid mite communities indicate Holocene permafrost dynamics in Canadian mires Boreas (IF 2.477) Pub Date : 2020-05-20 Inkeri Markkula; Peter Kuhry
Permafrost thaw in peatlands is one of the most widespread and worrying consequences of climate warming in the sub‐Arctic area. To predict future climate feedbacks, it is important to study the history of permafrost aggradation and thaw. Plant macrofossil analysis with radiocarbon dating has been widely used in detecting past permafrost dynamics in peatlands, however, due to a lack of permafrost‐specific
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Collagen fingerprinting for the species identification of archaeological amphibian remains Boreas (IF 2.477) Pub Date : 2020-05-20 Michael Buckley; Marc Cheylan
Amphibians are well known as being one of the main groups of animals today most threatened by environmental changes but they are also some of the least well understood of all terrestrial vertebrates. This gap in knowledge is much greater as we look further back into the relatively recent past, despite representing an invaluable resources in archaeological and palaeontological assemblages that are more
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Holocene tephra record of Lake Veliko jezero, Croatia: implications for the central Mediterranean tephrostratigraphy and sea level rise Boreas (IF 2.477) Pub Date : 2020-05-11 Ivan Razum, Slobodan Miko, Nikolina Ilijanić, Maurizio Petrelli, Ursula Röhl, Ozren Hasan, Biagio Giaccio
Core M1‐A from Mljet Island, Croatia, was retrieved from a submerged sinkhole to investigate tephra and reconstruct past sea levels. Eleven tephra layers were found, out of which six are macroscopically visible, while five are cryptotephra. For two of the tephra layers, glass shard concentrations were below the critical amount necessary for reliable analysis, while two more originated from a stratigraphical
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Testing polymineral post‐IR IRSL and quartz SAR‐OSL protocols on Middle to Late Pleistocene loess at Batajnica, Serbia Boreas (IF 2.477) Pub Date : 2020-05-04 Anca Avram, Daniela Constantin, Daniel Veres, Szabolcs Kelemen, Igor Obreht, Ulrich Hambach, Slobodan B. Marković, Alida Timar‐Gabor
The loess–palaeosol sequence of Batajnica (Vojvodina region, Serbia) is considered as one of the most complete and thickest terrestrial palaeoclimate archives for the Middle and Late Pleistocene. In order to achieve a numerical chronology for this profile, four sets of ages were obtained on 18 individual samples. Equivalent doses were determined using the SAR protocol on fine (4–11 μm) and coarse (63–90 μm)
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