Pteropoda (Mollusca, Gastropoda, Thecosomata) from the Paleocene-Eocene Thermal Maximum (United States Atlantic Coastal Plain)

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Author(s): Janssen, Arie W.; Sessa, Jocelyn A.; Thomas, Ellen
Author Affiliation(s): Primary:
Naturalis Biodiversity Center, Leiden, Netherlands
American Museum of Natural History, United States
Yale University, United States
Volume Title: Palaeontologia Electronica
Source: Palaeontologia Electronica, 19(3). Publisher: Coquina Press, Calvert, TX, United States. ISSN: 1935-3952
Note: In English with Spanish and German and Arabic summaries. 118 refs.; illus., incl. 5 tables, sketch map
Summary: The response of many organisms to the Paleocene-Eocene Thermal Maximum (PETM; ∼56 Ma) has been documented, but marine mollusks are not known from any deposits of that age. For the first time, we describe a PETM assemblage of pteropods (planktic mollusks), consisting of six species representing three genera (Altaspiratella, Heliconoides and Limacina). Four species could be identified to species level, and one of these, Limacina novacaesarea sp. nov., is described as new. Only the genus Heliconoides was previously known from pre-Eocene sediments, with a single Campanian specimen and one latest Paleocene species. We recovered pteropods from the Marlboro Clay (United States Atlantic Coastal Plain), deposited at paleodepths from inner shelf (southern Salisbury Embayment) to middle-outer shelf (New Jersey Coastal Plain). Most living pteropod assemblages inhabit water depths of 200 m or more, so their occurrence at shelf depths may reflect transport from more open waters. During the PETM, pH in the upper waters of the ocean may have declined, but this did not cause dissolution of pteropods before they reached the seafloor, possibly due to buffering in coastal waters. The apparently sudden appearance of three genera could reflect better preservation due to high sedimentation rates, since the underlying and overlying formations show poor preservation of calcareous microfossils. Potential ancestors, however, have not been found anywhere, so we consider it more likely that the rapid environmental changes during the PETM, such as temperature, runoff and nutrient fluxes, and ocean water chemistry, may have triggered pteropod diversification.
Year of Publication: 2016
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Altaspiratella; Aquia Formation; Atlantic Coastal Plain; Bass River; Bass River Site; Benthic taxa; Biodiversity; Burlington County New Jersey; Cambridge-Dorchester Regional Airport; Cenozoic; Charles County Maryland; Clayton New Jersey; Dorchester County Maryland; Electron microscopy data; Eocene; Foraminifera; Gastropoda; Gloucester County New Jersey; Heliconoides; Heterobranchia; Leg 174AX; Limacina; Limacina novacaesarea; Limacinidae; Limacinoidea; Lower Eocene; Marine environment; Marlboro Clay; Maryland; Mattawoman Creek-Billingsley Road; Microfossils; Mollusca; New Gretna New Jersey Quadrangle; New Jersey; New taxa; Ocean Drilling Program; Paleo-oceanography; Paleobathymetry; Paleocene; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleoenvironment; Paleogene; Pitman East Quadrangle; Plotophysops; Pteropoda; SEM data; Tertiary; Thanetian; Thecostomata; United States; Upper Paleocene; Wilson Lake; Wilson Lake Site; Ypresian
Coordinates: N383204 N383204 W0760144 W0760144
N393900 N393921 W0750231 W0750600
N393642 N393642 W0742612 W0742612
N383655 N383655 W0770252 W0770252
Record ID: 2018078983
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