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100 1 a| Gay, Norman K.,e| author.=| ^A1473420;

245 10 a| Paleoecology of the Yorktown formation in Edgecombe County, North Carolina /c| by Norman Kennedy Gay.;

264 0 c| 1980.;

300 a| 139 leaves :b| illustrations, maps ;c| 28 cm;

336 a| textb| txt2| rdacontent;

337 a| unmediatedb| n2| rdamedia;

338 a| volumeb| nc2| rdacarrier;

502 b| M.S.c| East Carolina Universityd| 1980;

500 a| Presented to the faculty of the Department of Geology;

500 a| Advisor: Scott W. Snyder;

520 3 a| Paleoecologic and biostratigraphic analysis of Upper Neogene sediments in Edgecombe County, North Carolina are based upon bivalves from twelve surface exposures. Ninety-four species of bivalves have been identified. The distributional patterns of bivalve species reveals three assemblages: 1) a Placopecten virginiana-Lucina cribraria Assemblage, 2) a Lucina trisulcata-Pleuromeris tridentata Assemblage, and 3) a Mulinia congesta-Anadara improcera Assemblage. The Placopecten-Lucina and Lucina-Pleuromeris Assemblages represent low stress open marine conditions. The Mulinia-Anadara Assemblage represents a high stress marginal marine environment. The stratigraphic relationships among these assemblages indicate either 1) a minor marine regression or 2) the lateral shifting of local environments and subsequent response of the organisms to changing conditions. Sediment analysis of 34 samples, in conjunction with information about the functional morphology of bivalve species, indicates that post-mortem transport has been minimal (i.e., species are preserved in sediment types for which they were specifically adapted). Values of the Shannon-Weiner species diversity index support both sedimentary and faunal evidence. Detailed analysis of the ecophenotypic variation exhibited by Lucina crenulata is also consistent with interpretations based on other approaches.;

504 a| Includes bibliographical references (leaves 126-137).;

650 0 a| Paleoecologyz| North Carolinaz| Edgecombe County.=| ^A43208;

650 7 a| Paleoecology.2| fast0| (OCoLC)fst01051384;

655 7 a| dissertations.2| aat0| (CStmoGRI)aatgf300028029;

655 7 a| Academic theses.2| fast0| (OCoLC)fst01726453;

655 7 a| Academic theses.2| lcgft;

655 7 a| Thèses et écrits académiques.2| rvmgf0| (CaQQLa)RVMGF-000001173;

700 1 a| Snyder, Scott W.,e| degree supervisor.=| ^A1304297;

710 2 a| East Carolina University.b| Department of Geology.?| UNAUTHORIZED;

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/11173;

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Paleoecology of the Yorktown formation in Edgecombe County, North Carolina / by Norman Kennedy Gay.

Author/creator	Gay, Norman K. author.
Other author	Snyder, Scott W., degree supervisor.
Other author	East Carolina University. Department of Geology.
Format	Theses and dissertations
Production	1980.
Description	139 leaves : illustrations, maps ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Paleoecology--North Carolina. --Edgecombe County.

Summary	Paleoecologic and biostratigraphic analysis of Upper Neogene sediments in Edgecombe County, North Carolina are based upon bivalves from twelve surface exposures. Ninety-four species of bivalves have been identified. The distributional patterns of bivalve species reveals three assemblages: 1) a Placopecten virginiana-Lucina cribraria Assemblage, 2) a Lucina trisulcata-Pleuromeris tridentata Assemblage, and 3) a Mulinia congesta-Anadara improcera Assemblage. The Placopecten-Lucina and Lucina-Pleuromeris Assemblages represent low stress open marine conditions. The Mulinia-Anadara Assemblage represents a high stress marginal marine environment. The stratigraphic relationships among these assemblages indicate either 1) a minor marine regression or 2) the lateral shifting of local environments and subsequent response of the organisms to changing conditions. Sediment analysis of 34 samples, in conjunction with information about the functional morphology of bivalve species, indicates that post-mortem transport has been minimal (i.e., species are preserved in sediment types for which they were specifically adapted). Values of the Shannon-Weiner species diversity index support both sedimentary and faunal evidence. Detailed analysis of the ecophenotypic variation exhibited by Lucina crenulata is also consistent with interpretations based on other approaches.
General note	Presented to the faculty of the Department of Geology
General note	Advisor: Scott W. Snyder
Dissertation note	M.S. East Carolina University 1980
Bibliography note	Includes bibliographical references (leaves 126-137).
Genre/form	dissertations.
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

Paleoecology of the Yorktown formation in Edgecombe County, North Carolina / by Norman Kennedy Gay.

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