Ostracoda communities from DSDP Holes 95-612 and 95-613

Ninety-three samples from DSDP Leg 95, Sites 612 and 613, were examined for ostracodes to aid in the study of paleoceanography and paleodepth. In total, more than 25 genera were recovered. The most abundant and diverse ostracode assemblages were from the middle Eocene at both sites; lower and upper Eocene and Pliocene-Pleistocene assemblages were less abundant and were dominated by only three or four species.
The middle Eocene assemblages were the most diagnostic of paleoenvironment and suggest water depths of 1000 to 2000 m. These assemblages are similar to other middle Eocene assemblages known from the Caribbean and North Atlantic, and signify a relatively cosmopolitan fauna that inhabited moderately deep but relatively warm bottom waters.

本研究对深海钻探计划（Deep Sea Drilling Project, DSDP）第95航次612和613站位的93件样品开展介形类（ostracodes）化石检索，以助力古海洋学（paleoceanography）与古水深（paleodepth）相关研究。共鉴定出超过25个介形类属级分类单元。
两个站位中，介形类化石组合丰度与多样性最高的层位均为中始新统；下始新统、上始新统以及上新世-更新世的介形类组合丰度偏低，且仅以3至4个物种为优势类群。
中始新统的介形类组合对古环境的指示性最强，其对应古水深约为1000至2000米。该类介形类组合与加勒比海（Caribbean）及北大西洋（North Atlantic）地区已报道的中始新世介形类组合特征相似，指示当时存在一类栖息于中等深度但水温相对较高的广布性底栖动物群。