(Figure 2) Distribution of planktonic foraminifera in the upper Paleocene of DSDP Hole 93-605 ...

• Main Authors: Nederbragt, Alexandra J, von Hinte, J E
• Format: Dataset
• Language: English
• Published: PANGAEA 1987
• Subjects: Sample code/label; DEPTH, sediment/rock; Radiolarians abundance; Foraminifera, benthic; Subbotina triloculinoides; Subbotina velascoensis; Acarinina mckannai; Morozovella pusilla; Morozovella angulata; Morozovella aequa; Morozovella occlusa; Morozovella acuta; Planorotalites chapmani; Planorotalites pseudomenardii; Subbotina primitiva; Acarinina soldadoensis; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg93; Glomar Challenger; Deep Sea Drilling Project DSDP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.250715; https://doi.pangaea.de/10.1594/PANGAEA.250715

Good faunal preservation in the upper part of the Planorotatites pseudomenardii Zone at Deep Sea Drilling Project Site 605, northwestern Atlantic, allows a biometric analysis of the upper Paleocene planktonic foraminiferal species Planorotatites pseudomenardii (Belli), a keeled species that probably developed from a middle Paleocene unkeeled Planorotalites form. Multivariate analysis shows a consistent separation of all Planorotatites specimens into two groups, which are differentiated by the presence or absence of a complete keel; other variables are only of minor importance. The keeled group coincides with P. pseudomenardii. We recognize only one unkeeled species, Planorotalites chapmani (Parr), with Planorotalites ehrenbergi (Bolli), Planorotalites imitata (Subbotina), Planorotalites planoconica (Subbotina), Planorotalites troelseni (Loeblich and Tappan), and Planorotalites hausbergensis (Gohrbrandt) as junior synonyms. P. chapmani ranges from the middle Paleocene to at least the top of the upper ... : D = dominant, A = abundant, C = common, R = rare, ? = questionable, - = absent. ...