Abstract Pollen of middle Oligocene to early Miocene age from core sediments from the New Jersey Shallow Shelf (Atlantic Coastal Plain: IODP-Expedition 313, Site M0027A), was analyzed using light- and scanning electron microscopy, and a pollen-based bioclimatic analysis was performed. The microflora is dominated by Quercus pollen. Pollen ornamentations indicate that Quercus pollen most likely originated from species of sections Quercus, Lobatae, Quercus/Lobatae and aff. section Protobalanus. Eotrigonobalanus, an extinct Fagaceae lineage, was present in the coastal plain. Relative abundances of several tree taxa (e.g., Carya) did not change significantly between the Oligocene warm phases, but contrast to late middle Miocene (comprising most of the Langhian and Serravallian) records from the same area. By assigning terrestrial palynomorphs to paleovegetation units, topographic movements of these units were identified. The mesophytic forest was the most widespread and zonal vegetation type in the hinterland through the analyzed interval. Periodic changes in the relative abundances of paleovegetation units suggest altitudinal vegetation movements responding to global climate change. Observed movement signals are generally weak, but increases in bisaccate pollen, representing spread of high- and mid-latitude forest, probably reflect the onset of cold intervals such as cooling phases at ~ 29.1, ~ 28.5, and 23.5 Ma. Spread of edaphically controlled forest formations during regression phases also indicates climate change. The onset of the Mi-1 event at ~ 23.03 Ma is probably reflected by a decrease in pollen-inferred paleotemperatures, although the event itself occurred during a sedimentation hiatus. Pollen-based paleoclimate reconstructions indicate long-term stability in temperature and precipitation within the humid warm temperate zone.

中文翻译：

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新泽西州古植物群和北美东部气候通过古近纪-新近纪暖期

摘要 来自新泽西浅陆架（大西洋沿岸平原：IODP-Expedition 313，Site M0027A）核心沉积物的中渐新世至中新世早期的花粉，使用光学和扫描电子显微镜进行了分析，并基于花粉进行了生物气候分析。执行。微生物区系以栎属花粉为主。花粉纹饰表明，栎属花粉最有可能源自栎属、Lobatae、Quercus/Lobatae 和 aff 种。部分 Protobalanus。Eotrigonobalanus 是一种已灭绝的山毛榉科谱系，存在于沿海平原。几个树木类群（例如山核桃）的相对丰度在渐新世暖期之间没有显着变化，但与来自同一地区的中新世晚期（包括大部分朗吉阶和塞拉瓦阶）记录形成对比。通过将陆地孢粉形物分配给古植被单元，确定了这些单元的地形运动。中生林是分析区间内腹地分布最广、分布最广的带状植被类型。古植被单位相对丰度的周期性变化表明海拔植被运动响应全球气候变化。观察到的运动信号一般较弱，但代表高纬度和中纬度森林蔓延的双囊花粉增加，可能反映了寒冷间隔的开始，例如~29.1、~28.5和23.5 Ma的冷却阶段。在回归阶段由土壤控制的森林形成的蔓延也表明气候变化。Mi-1 事件在 ~ 23.03 Ma 开始可能反映为花粉推断的古温度下降，尽管事件本身发生在沉积中断期间。基于花粉的古气候重建表明湿润暖温带内的温度和降水长期稳定。