Foraminiferal assemblages were studied as part of a multi-proxy dataset from an expanded record of Late Turonian hemipelagic deposition obtained from the Bch-1 research borehole in the Bohemian Cretaceous Basin (Central Europe). Based on fluctuations in the Si/Al ratio, precession-paced cyclicity (18–23 kyr) is recognized in the studied interval and interpreted to reflect changes in seasonality. This

The India-Asia collision led to the demise of the Tethys Ocean, and the subsequent uplift of the Qinghai-Tibet Plateau had a profound impact on Cenozoic topography, oceanography, and climate. However, collision ages vary depending on collision definition and methodology, with the cessation of marine deposition constraining the minimum/youngest collision age. The Enba and Zhaguo formations of the Qumiba

An understanding of the modern relationship between diatom species and elevation is a prerequisite for using fossil diatoms to reconstruct relative sea level (RSL). We described modern diatom distributions from seven transects covering unvegetated subtidal environments to forested uplands from four tidal wetland sites (Smith Creek, Bone River, Niawiakum River, and Naselle River) of Willapa Bay, Washington

We determined the abundances and concentrations of coccoliths and alkenones in 66 surface sediment samples from the northwest North Atlantic to evaluate the role that surface ocean temperature, salinity, sea-ice cover, and productivity have on the regional distribution of these two biological remains produced by haptophytes in the photic zone. In areas with sea-ice cover of more than 1 month per year

The middle Miocene is marked by a changeover from a warm climatic period (Miocene Climatic Optimum, ~17-14.7 Ma), to a transitional phase (Middle Miocene Climatic Transition), culminating in a cold stage (Icehouse Mode, ~13.8 Ma). This period is associated with a positive excursion of δ13C (“Monterey Excursion”), showing a series of δ13C maxima (CM events) highlighted by cooling peaks in the δ18O values

Bora Bora, French Polynesia, represents the classic oceanic (Darwinian) barrier reef system, complete with a deep and extensive lagoon. The foraminiferal faunas of such oceanic barrier reef lagoons have never been studied in detail. How they relate to atoll lagoons and more broadly to coral reef lagoons in general is not known. Back-reef lagoon samples from Bora Bora were studied for their foraminiferal

Changes in dinoflagellate assemblages indicate regional paleoceanographic events affecting western Colombia. Integration of palynomorph, planktonic foraminifera, and calcareous nannoplankton data from a 616 m thick outcrop section in the Ladrilleros-Juan Chaco region allows the construction of a detailed and reliable chronological framework and identification of marine high-productivity intervals.

A comprehensive stratigraphic framework is presented for the upper Campanian-lower Maastrichtian succession of the Elles section in North-central Tunisia. This has been done by applying an integrated approach including calcareous nannofossil and planktonic foraminiferal biostratigraphy in conjunction with carbon isotope stratigraphy. The studied interval spans from the Uniplanarius sissinghii (CC21)

In response to modern global warming and climate emergency, large oxygen-depleted oceanic areas, known as Oxygen Minimum Zones (OMZs) have been expanding for the past decades, with negative ecological and economic consequences on food chains, marine ecosystems and resources, biodiversity, and fisheries. The future evolution of these areas and their expansion for the next decades and centuries remain

The recent growing interest in Late Cretaceous biserial planktonic foraminifera (heterohelicids) has greatly enhanced their use as paleoceanographic and biostratigraphic markers. Pseudotextularia nuttalli, one of the most common cosmopolitan planktonic foraminifera, has an exceptionally long evolutionary range (Turonian-Maastrichtian). The image processing procedure we developed in this study enabled

We examine the living and dead benthic foraminiferal assemblages from the topmost 10 cm (using 150 μm sieve fraction) of three sedimentological short records collected in the Kveithola Trough (northwest Barents Sea). Our aim is to reconstruct the environmental variations of the last decades, connected to the interaction among the North Atlantic and the Arctic water masses. Our samples are collected

Even at intermediate depths, where the environment is adequate for carbonate accumulations, a loss of calcareous microfossils may occur by the dissolution of CaCO3. Changes in the microfossil preservation indexes are a proxy for identifying oceanographic variations in the past. The goal of this study is to identify minor changes in the degree of preservation of foraminiferal assemblages in a supra-lysoclinal

This study clarified the centennial-scale changes in meiobenthic bay ostracod assemblages in Japan over the past approximately 3000 years with relation to various human-induced and natural environmental factors. These factors were inferred via integrated multiproxy methods of high-resolution geological analyses of core sediments obtained from a shallow bay off a coastal plain, along with literature

Planktonic foraminifera are important calcifiers in the modern ocean. Despite this importance, the main functions of foraminifera's test and ornamentation such as spines are unclear. Spinose species dominate the planktonic foraminifera population in subtropical oligotrophic gyres, while non-spinose species dominate in deeper waters and at high latitudes suggesting that spines help foraminifera in food-limited

Stable oxygen isotope measurements on calcitic valves of benthic ostracodes (δ18Oost) from the northern Bering and Chukchi Seas were used to examine ecological and hydrographic processes governing ostracode and associated seawater δ18O values. Five cryophilic taxa were analyzed for δ18Oost values: Sarsicytheridea bradii; Paracyprideis pseudopunctillata; Heterocyprideis sorbyana; Heterocyprideis fascis;

Little is known about the marine palynology of the neotropical oceans. Here, we present the first comprehensive study of organic-walled dinoflagellate cyst assemblages in 52 surface marine sediment samples from the southern Caribbean (SC) and the eastern tropical Pacific (ETP) and explain how these assemblages relate to sea-surface parameters. Multivariate analyses show that of the several environmental

We generated high-resolution biochronological records in the Mediterranean Sea covering the period extending to the Late-glacial. The present study is based on micropaleontological, sea-surface temperature (SST) and oxygen isotopic analyses performed along three well-dated deep-sea cores: REC1353, KET80–19 and MD84–641 recovered in the Siculo-Tunisian Strait, Tyrrhenian Sea and Levantine Basin, respectively

Globigerinoides ruber (white), a tropical to sub-tropical planktonic foraminiferal species which dwells in the mixed layer, has garnered significant attention of paleoceanographic investigations. Recent studies on G. ruber (w) morphotypes (G. ruber sensu stricto (s.s.) and G. ruber sensu lato (s.l.)) have inferred differences in seasonal calcification depths and offsets in isotopic and elemental data

Phytoplankton blooms in the Ross Sea generally occur during late spring-early summer, especially in the marginal ice zone, polynya areas and continental shelves. These blooms are generally dominated by many species of diatoms and the haptophyte Phaeocystis antarctica, and are driven by water column dynamics. However, most of the information on diatoms in the Ross Sea regards their ecological and biogeochemical

Through transporting heat around the world and thereby regulating global climate, ocean circulation is an integral part of Earth's climate system that likely changed substantially on glacial-interglacial timescales in the deep North Atlantic Ocean. However, quantitative records on deep-water dynamics in the North Atlantic older than ~1 Myr are sparse and typically of low temporal resolution. Here we

Deep-time sea-level changes associated with the Paleocene-Eocene Thermal Maximum (PETM) are of great interest to paleoceanographers and paleontologists, especially in shallow marine settings, like the Atlantic Coastal Plain PETM sections of the Eastern North American Continental Shelf. Accurate paleo-water depth reconstruction is essential to properly interpret and contextualize any PETM-associated

Coccolithophores were collected at 21 stations during summer 2016, from coastal and offshore areas of the Central Mediterranean Sea, to describe the ecology of the coccolithophore community integrating information on their abundance, environmental parameters (salinity, temperature, dissolved oxygen, and fluorescence) and oceanographic data. Emiliania huxleyi dominated the assemblage from surface to

Ontogenic trajectories recorded within the fossilized calcite tests of planktic foraminifera are significant for understanding their paleoecology and evolution. High-resolution 3-D imaging techniques enable quantitative measurement of test calcite and enclosed cavity volumes allowing a detailed characterization of the ontogenetic variations in the biomass to calcite ratio. Here we used micro-CT scanning

This study clarified the centennial-scale changes in meiobenthic bay ostracod assemblages in Japan over the past approximately 3000 years with relation to various human-induced and natural environmental factors. These factors were inferred via integrated multiproxy methods of high-resolution geological analyses of core sediments obtained from a shallow bay off a coastal plain, along with literature

Fossil ostracode assemblages were investigated in three sediment cores from the Chukchi Plateau, in the western Arctic Ocean, in order to reconstruct its late Quaternary paleoceanographic history. The cores were retrieved from water depths of 435–741 m, within the range of modern Atlantic Water (AW). The ostracode abundance shows distinct glacial/interglacial fluctuations, suggesting the suppression

Episodes of pronounced climatic warming in the early Eocene (56–48 Ma) provide insights into how biological systems might respond to future climate changes. Eocene climate reconstructions for the Southwest (SW) Pacific have proved challenging due to some disparities between geochemical proxy-based estimates for sea temperatures and estimates derived from climate models. Changes in marine phytoplankton

Stable oxygen isotope measurements on calcitic valves of benthic ostracodes (δ18Oost) from the northern Bering and Chukchi Seas were used to examine ecological and hydrographic processes governing ostracode and associated seawater δ18O values. Five cryophilic taxa were analyzed for δ18Oost values: Sarsicytheridea bradii; Paracyprideis pseudopunctillata; Heterocyprideis sorbyana; Heterocyprideis fascis;

We investigated the microhabitats of benthic foraminifera and stable oxygen and carbon isotope compositions of living (stained) Elphidium batialis Saidova off Hidaka (northern Japan) in the Northwestern Pacific continental margin. In the study area, six major species reside in three microhabitats that are vertically distributed within the sediment column. Bolivina spissa, Uvigerina akitaensis, and

Nummulitic accumulations are an important component of the Eocene sedimentary record in the Neotethyan realm. Their age, paleoenvironmental significance and depositional model are almost exclusively based on the interpretation of the larger benthic foraminiferal assemblages. We show here, however, that the high-resolution study of the other, often neglected, microfossils (calcareous nannoplankton and

The overall occurrence, composition, stratigraphic distribution and palaeobiogeographic and biostratigraphic significance of ostracod faunas in the Silurian of the Southern Tien Shan in Uzbekistan and Tajikistan, central Asia is, for the first time, documented herein. The faunas are diverse in each of the four Silurian series, with podocopes, palaeocopes and mydocopes present and podocopes dominant

Identification of autochthonous, allochthonous, and reworked (derived fossil) taxa in diatom analyses is of fundamental importance for understanding how taphonomic processes affect diatom assemblages and for estimating paleoenvironments in coastal areas. To characterize modern and Neogene diatom assemblages, we surveyed the distributions of modern diatom assemblages and of Neogene fossil diatom assemblages

The Recent ostracods from the tidal flats of Al-Hudeida City, situated at the southern tip of the Red Sea have been studied. Thirty-eight species belonging to 32 genera could be identified. One new species, Hiltermannicythere hishamalii, is described. The assemblage of the fauna shows a close similarity to the Indo-Pacific region, especially to the east coast of Africa and the Persian Gulf.

This study explores the role of the Nile River damming in shaping the recent benthic ecology in the southeastern Levantine (SL) Basin, the saltiest, hottest and the most oligotrophic basin within the Mediterranean Sea. The spatial distribution and diversity patterns of dead benthic foraminiferal (BF) faunas from the SL shelf were analyzed at 59 stations (40–100 water depths) sampled in August 2011

The well-exposed Upper Kimmeridgian to Lower Tithonian sequences of the Boulonnais Region (Northern France) are revisited with an integrated litho-, bio- and chemostratigraphic study of the Cran du Noirda (CDN) and Pointe de la Crèche (PDC) sections. Three foraminiferal and two ostracods zones are identified and tied to the ammonite zones previously established in the Boulonnais. The Upper Kimmeridgian

Knowledge of European intertidal salt marsh ostracods is reviewed and synthesised, focusing on data from estuaries in Great Britain and the Iberian Peninsula, in order to establish a context for discussion of their taxonomy, biogeography, (macro)ecology, palaeoecology, (macro)evolution and conservation. The combined data support the emerging view that it is possible to recognise distinctive and ecologically

Calcareous nannofossils are micrometric calcite platelets secreted by the photosynthetic algae named coccolithophores and incertae sedis. Calcareous nannoplankton inhabit the photic zone from coast to open-ocean and have left an abundant fossil record since the Triassic. Therefore, they constitute an interesting material for geochemical studies although they have been overlooked in comparison to foraminifera

Here, we present the results of a quantitative analysis performed on Pliensbachian calcareous nannofossil assemblages from the E Rodiles section (northern Spain), which allowed us to determine their changes in response to paleoenvironmental variations in a key connection between the Boreal and Tethyan realms. Nannofossil data are compared to published carbon and oxygen stable isotope data and organic

Dinoflagellate cysts assigned to the subfamily Protoperidinioideae are frequently recorded in Miocene coastal deposits, and their relative abundance is directly related to primary productivity and favorable post depositional conditions. However, these microfossils are poorly studied in Brazilian Miocene sequences. This paper presents the results of a palynological study on 18 samples obtained from

Ocean warming is predicted to have negative impacts on marine calcifying organisms. Larger benthic foraminifers (LBFs) are single-celled marine organisms with calcareous shells, and the third-highest carbonate producer in clear, shallow-water, tropical and subtropical, regions. Previous studies have reported declining shell growth when cultured at higher temperatures, although the specific physical

Abstract We applied morphometric analyses performed with a polarizing light microscope on a total of 100 specimens of Carinolithus superbus and C. magharensis to clarify the taxonomy based on measurements of total height (TH), stem height (SH), stem width (SW), proximal shield width (PS), distal shield width (DS) and thickness of the distal shield (TDS). Statistical analyses showed that three of these

Abstract Research on sediment drifts (the non-genetic term for contourites) is becoming increasingly popular due to their economic potential and usefulness as records of past climate and bottom water circulation changes. We examine the geographical extent of a sediment drift at the Cipero Formation, Trinidad (Cipero-1 site) using benthic foraminifera to measure (1) winnowing, based on the statistical

Abstract Proxy records of past sea-level change provide a means of extending sea-level histories from tide gauges into the pre-industrial period. This is especially valuable in the South Atlantic region where sea-level data are limited to only a few tide-gauge records. Multi-proxy approaches to sea-level reconstruction are relatively rare but have distinct benefits when groups of micro-organisms are

As a part of our palynological investigations of the Upper Cretaceous deposits from the Rif Chain, the present study of the dinoflagellate cyst assemblage distribution and palynofacies was carried out in the Bou Lila section, located northeast of the city of Ksar El-Kébir (External Rif, northwestern Morocco). The study focused on the age refinement and interpretation of paleoenvironmental conditions

Abstract Previous studies of pollen in northern Borneo lack basic data on surface soil pollen as a basis for the quantitative reconstruction of paleoclimate and modern palynological comparison. In this study, we conducted palynological analysis on 86 surface soil samples from northern Borneo, in addition to core NS07-25 from the southern South China Sea (SCS). The results reveal that the principal

Abstract The White Sea is a small semi-enclosed Arctic sea influenced by Atlantic waters. It was completely covered by the Scandinavian Ice Sheet in the Late Pleistocene and plays a key role in the reconstruction of the degradation of the Scandinavian Ice Sheet and Atlantic Water advection into the Arctic Ocean. We examined the inflow of Atlantic water into the White Sea Basin as the leading feature

Abstract Calcareous nannofossils of the Serravallian/Tortonian transition, known as the Sarmatian in the Paratethys were obtained from the northern Croatia, Central Paratethys. The nannofossil biostratigraphy of the studied area included early Sarmatian biohorizons; the reliability of these and previous biohorizons was tested, and the known biostratigraphic and magnetostratigraphic datums of the Paratethys

Abstract The oceanic redox state has played an essential role in the evolution of life on earth, and oceanic “anoxic events” have been proposed as one of the causal mechanisms for mass extinctions. During the mid-Cretaceous, oceanic anoxic events (OAEs) occurred several times and had a substantial impact on the biosphere. Planktic foraminifers are marine planktons with calcite tests, and their shells

Abstract This study records the diatom flora from sedimentary deposits found within a coastal cottage, following the November 2016 Kaikōura earthquake and tsunami at Little Pigeon Bay, Banks Peninsula, Aotearoa-New Zealand. Unlike previous studies of diatoms from modern tsunami deposits, the sediments in this study were isolated from any previous (and subsequent) reworking of sediments. The diatom

Abstract Globorotalia truncatulinoides oscillations have been recorded from different marine sediment cores collected in the central and western Mediterranean Sea. The abundances of this species over the last 500 yrs. demonstrates its potential value as bio-indicator of particular oceanographic condition during the Maunder Minimum (MM) event of the Little Ice Age (LIA). The comparison between the G

Abstract Ostracods are the most abundantly preserved arthropod group in the fossil record, but they are almost entirely represented only by their calcitic carapaces. In over two hundred years of fossil ostracod research, only about 33 occurrences of fossil ostracods that include preserved appendages, or soft parts, have been reported. These range from the Ordovician through to the Holocene, and are

Abstract The Triassic was a turning in the history of biodiversity: bracketed by two major biotic crises, characterised by major biotic, climatic and tectonic events, it saw the transition from the Palaeozoic to the Modern evolutionary faunas. Herein, we propose the first synthetic analysis of the diversity of marine and brackish-water ostracods over the entire Triassic, in the light of palaeoecological

Abstract Growth variability in extant Peneroplis has drawn attention since early times. There is general agreement that the aberrations in recent populations of Peneroplis are natural and intraspecific. For these reasons, some authors have questioned the systematic relationships among living Peneroplis species. In this study, we explore variation in an exceptionally abundant population of Peneroplis

Abstract A complex suite of geological information from deep-sea drilling cores can provide insights into the Cenozoic evolution of the South China Sea (SCS). Therefore, the thick sediment sequence, obtained during International Ocean Discovery Program (IODP) Expedition 368 at Site U1501 in the northern SCS, provides excellent materials to investigate the paleoceanographic and geological evolution

Abstract The upper Miocene diatom-bearing section of Pecetto di Valenza (Piedmont, NW Italy) represents a unique site for reconstructing the paleoceanographic processes that occurred before the onset of the Messinian salinity crisis in the northernmost Mediterranean basin. The combined analysis of foraminifera, calcareous nannofossils, diatoms and other siliceous microfossils observed in the marly

Abstract We present a 500-kyr productivity reconstruction of the southwest Indian Ocean (MD96–2077; Natal Valley) and the eastern South Atlantic (Sites 1266; Walvis Ridge) from coccolithophore assemblages and coccolith geochemistry. The study sites are situated in two different hydrographic regimes: one located in the upper boundary of the Agulhas Current (AC) and the other in the open ocean branch