Foraminiferal paleoenvironments of Paleocene Wilcox (60 my) Tew Lake Marker.
Article Type:
Brief Article
Sedimentation and deposition (Research)
Historical geology (Research)
Glawe, L.
Pub Date:
Name: The Proceedings of the Louisiana Academy of Sciences Publisher: Louisiana Academy of Sciences Audience: Academic; Professional Format: Magazine/Journal Subject: Science and technology Copyright: COPYRIGHT 2000 Louisiana Academy of Sciences ISSN: 0096-9192
Date: Annual, 2000
Event Code: 310 Science & research
Product Code: 9106428 Solid Waste R&D; 8500000 Science, Research & Development; 8515100 Basic Research NAICS Code: 92411 Administration of Air and Water Resource and Solid Waste Management Programs; 5417 Scientific Research and Development Services SIC Code: 8730 Research and Testing Services
Geographic Scope: Louisiana; United States Geographic Name: Louisiana Geographic Code: 1U7LA Louisiana; 1USA United States

Accession Number:
Full Text:
Depositional environments of the subsurface Tew Lake Marker (TLM) are interpreted from conventional cores taken from the Hunt Petroleum A-68 well in the NeboHemphill Field, LaSalle Parish, Louisiana. The TLM occurs within a delta sequence known as the Wilcox. Interpretations of electric/sonic logs indicate the TLM is usually a 10-ft thick, dense (limey) interval of silty beds that overlies a bed of lignite. Analyses of foraminiferal assemblages contained in eight core samples reveal the paleoenvironmental history of the Paleocene Gulf of Mexico as recorded by the TLM depositional sequence. Underlying the TLM is a distributary sand-lignite sequence, representing an abandoned delta lobe. The TLM is a transgressive-bay sequence that resulted from subsidence of delta-lobe deposits and/or a slight rise in sea level. Open marine waters invaded the coastal delta plain to form bays between delta lobes. Coastal areas were modified by waves and currents from the open gulf that changed the hydrodynamics and salinity of the bays. Paleosalinities of these bays varied from brackish water in inner bays to normal marine water in outer bays.

Glawe, L. ULM.
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