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Title Turonian (Eaglefordian) stratigraphy of the Atlantic Coastal Plain and Texas
Creator/Author Valentine, P.C.
Publication Date1984 Jan 01
OSTI IdentifierOSTI ID: 5260255; TI85902206
Report Number(s)USGS-PP-1315
Resource TypeTechnical Report
Research OrgGeological Survey, Denver, CO (USA)
Subject580100 -- Geology & Hydrology-- (-1989); COASTAL REGIONS-- STRATIGRAPHY; AGE ESTIMATION;CRETACEOUS PERIOD;FEDERAL REGION I;FEDERAL REGION II;FEDERAL REGION III;FEDERAL REGION IV;FOSSILS;POLLEN
Related SubjectGAMETES;GEOLOGIC AGES;GEOLOGY;GERM CELLS;MESOZOIC ERA;NORTH AMERICA;USA
Description/Abstract A stratigraphic analysis of 14 localities from New England to Georgia and of 1 well from the type area of the Eaglefordian Stage at Dallas, Texas, has resulted in a reevaluation of the ages of both formal and informal stratigraphic units previously established for the Atlantic and eastern Gulf Coastal Plains.^Lower Turonian strata, once thought to be absent beneath the Atlantic Coastal Plain, are present.^The study focused on a stratigraphic interval that is characterized by the presence of distinctive calcareous nannofossil and pollen floras.^The Complexiopollis-Atlantopollis pollen assemblage zone, widespread throughout the Atlantic and Gulf Coastal Plains and previously dated as late Cenomanian, is now shown to be late Cenomanian-early Turonian on the Gulf Coast on the basis of its occurrence with calcareous nannofossils, planktic foraminifers, and mollusks of that age.^On the Atlantic Coast, only the lower Turonian part of the Complexiopollis-Atlantopollis zone is known to be present.^Stratigraphic units that are now assigned to the lower Turonian include: (1) the Woodbridge Clay and Sayreville Sand Members of the Raritan Formation, New Jersey; (2) the upper part of the Raritan equivalent beneath the eastern shore of Virginia; (3) the Tuscaloosa equivalent (informal units K2, E, and part of F) in the South Carolina and Georgia coastal region; (4) the Tuscaloosa Formation of eastern Alabama and western Georgia; and, beneath the Gulf Coastal Plain; (5) the Coker Formation of western Alabama; and (6) the upper Britton and lowermost Arcadia Park Formations at Dallas, Texas.^Cenomanian strata beneath the Atlantic Coastal Plain are now interpreted to be much thinner than previously supposed.^The lower Turonian there is bounded by upper Turonian and uppermost Cenomanian hiatuses of regional extent, whereas the upper Cenomanian-Turonian section is relatively complete at Dallas, Texas.^75 refs., 10 figs., 1 tab.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 24
AvailabilityUS Geological Survey, 604 South Pickett St., Alexandria, VA 22304.
System Entry Date2001 May 13

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