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LEADER 05929ctm 2200613 i 4500

001 ocm20556027;

003 OCoLC;

005 20251021154321.0;

008 891027s1989 xx a bm 000 0 eng d;

035 a| (Sirsi) o20556027;

035 a| (OCoLC)20556027;

043 a| n-us-nc;

049 a| EREE;

050 4 a| QE445.N8b| M37x 1989;

100 1 a| Moran, LeAnn Kathleen,e| author.?| UNAUTHORIZED;

245 10 a| Petrography of unconfromable surfaces and associated stratigraphic units of the Eocene Castle Hayne Formation, southeastern North Carolina Coastal Plain /c| by LeAnn Kathleen Moran.;

264 0 c| 1989.;

300 a| 337 leaves :b| illustrations ;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| 1989;

500 a| Submitted to the faculty of the Department of Geology.;

500 a| Advisor: Scott W. Snyder;

500 a| Advisor: Lee J. Otte;

520 3 a| Nomenclature has been developed and petrographic information synthesized to interpret the origin of unconformable surfaces and associated sediments within and bounding the Eocene Castle Hayne Formation, southeastern North Carolina. Forty-two intraformational diastemic surfaces and four interformational disconformities cap intervals of sediment termed stratigraphic units, the thickness of which indicates amount of deposition or sediment preservation between successive intervals of non-deposition or erosion. Disconformities are marked by distinct faunal assemblages and by karst forms: diastemic surfaces, by marine features such as borings, eroded burrows, in situ encrustation, and mineral crusts of glaucony/iron sulfide and zeolite. Diastemic surfaces have been superimposed on the Eocene/Cretaceous disconformity. At the Eocene/Plio-Pleistocene and the Eocene/Recent contacts, disconformities were and continue to be developed. At the time of formation/exposure, grounds and bottoms associated with diastemic surfaces and disconformities were soft, firm, or hard, as evidenced by substrate requirements of their contained trace fossils. Intertidal and subtidal marine environments were sites of ground development. Grounds composed of medium to thick cross-bedded biosparites/biosparrudites with retiporiform and eschariforai bryozoans and fibrous cements formed in intertidal environments. Grounds established in subtidal environments are characterized by a variety of mineralization processes and by: 1) thin biomicrites with encrusting bryozoans and foraminifera or echinoderms and foraminifera; 2) thin phosphorites with diverse microfossils (bacterial structures, calcareous nannofossils, dinoflagellates, foraminifera, sponge spicules, holothuroidean sclerodermites); 3) medium pebble biomicrudites/conglomerates with pebble imbrication and a dominance of mollusks; and 4) medium to thick biomicrites/ biomicrudites with a diverse fauna (bryozoans, echinoderms, foraminifera, mollusks, siliceous sponges, brachiopods, corals, coccoliths). Castle Hayne stratigraphic units and associated diastemic surfaces originated from a series of marine depositional and diagenetic processes which, if uninterrupted, produced a hardground: deposition of a stratigraphic unit; non-deposition and induration; submarine erosion, exposure, boring, encrustation; deposition of a superjacent stratigraphic unit, non-deposition and induration of sub- and superjacent stratigraphic units. In subtidal areas crustiform glaucony/iron sul̨de and zeolites grew in microenvironments between indurated and overlying unindurated stratigraphic units. Pre-cursor orthochemical phosphate was developed by spreiten formers and opaque iron compounds formed through bacterial activity. Freshwater influenced the disconformity at the Eocene/Cretaceous boundary, but did not occur after formation of every Eocene diastemic surface. Freshwater diagenetic processes continue to modify the Castle Hayne Formation.;

504 a| Includes bibliographical references (leaves 235-254).;

650 0 a| Petrologyz| North Carolinaz| Castle Hayne.=| ^A15838;

650 0 a| Geology, Stratigraphicy| Eocene.=| ^A21000;

650 0 a| Limestonez| North Carolinaz| Castle Hayne.=| ^A18918;

651 0 a| Castle Hayne (N.C.)=| ^A1043311;

650 7 a| Eocene Geologic Epoch.2| fast0| (OCoLC)fst01352982;

650 7 a| Geology, Stratigraphic.2| fast0| (OCoLC)fst00940727;

650 7 a| Limestone.2| fast0| (OCoLC)fst00998856;

650 7 a| Petrology.2| fast0| (OCoLC)fst01059885;

648 7 a| From 40 to 55 million years ago2| fast;

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.1| https://id.oclc.org/worldcat/entity/E39PCjBYtMQ8V68G4TK3xQf9CP=| ^A1304297;

700 1 a| Otte, Lee J.,e| degree supervisor.1| https://id.oclc.org/worldcat/entity/E39PCjqPr6g8Y4QM48hR9D4tqP=| ^A130053;

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

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/12640;

949 a| Click on web addressw| asish| joyner101;

949 a| Click on web addressw| asish| hsl111;

994 a| C0b| ERE;

596 a| 1 4;

998 a| 329423;

999 a| ASK AT SPECIAL COLLECTIONS DESKw| ASISc| 1i| 329423-1001l| JSCJTHDm| JOYNERr| Ys| Yt| JSCJTHDu| 1/14/2022x| ETDz| JSPECCOLL;

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Petrography of unconfromable surfaces and associated stratigraphic units of the Eocene Castle Hayne Formation, southeastern North Carolina Coastal Plain / by LeAnn Kathleen Moran.

Author/creator	Moran, LeAnn Kathleen author.
Other author	Snyder, Scott W., degree supervisor.
Other author	Otte, Lee J., degree supervisor.
Other author	East Carolina University. Department of Geology.
Format	Theses and dissertations
Production	1989.
Description	337 leaves : illustrations ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Petrology--North Carolina. --Castle Hayne. Geology, Stratigraphic--Eocene. Limestone--North Carolina. --Castle Hayne. Castle Hayne (N.C.)

Summary	Nomenclature has been developed and petrographic information synthesized to interpret the origin of unconformable surfaces and associated sediments within and bounding the Eocene Castle Hayne Formation, southeastern North Carolina. Forty-two intraformational diastemic surfaces and four interformational disconformities cap intervals of sediment termed stratigraphic units, the thickness of which indicates amount of deposition or sediment preservation between successive intervals of non-deposition or erosion. Disconformities are marked by distinct faunal assemblages and by karst forms: diastemic surfaces, by marine features such as borings, eroded burrows, in situ encrustation, and mineral crusts of glaucony/iron sulfide and zeolite. Diastemic surfaces have been superimposed on the Eocene/Cretaceous disconformity. At the Eocene/Plio-Pleistocene and the Eocene/Recent contacts, disconformities were and continue to be developed. At the time of formation/exposure, grounds and bottoms associated with diastemic surfaces and disconformities were soft, firm, or hard, as evidenced by substrate requirements of their contained trace fossils. Intertidal and subtidal marine environments were sites of ground development. Grounds composed of medium to thick cross-bedded biosparites/biosparrudites with retiporiform and eschariforai bryozoans and fibrous cements formed in intertidal environments. Grounds established in subtidal environments are characterized by a variety of mineralization processes and by: 1) thin biomicrites with encrusting bryozoans and foraminifera or echinoderms and foraminifera; 2) thin phosphorites with diverse microfossils (bacterial structures, calcareous nannofossils, dinoflagellates, foraminifera, sponge spicules, holothuroidean sclerodermites); 3) medium pebble biomicrudites/conglomerates with pebble imbrication and a dominance of mollusks; and 4) medium to thick biomicrites/ biomicrudites with a diverse fauna (bryozoans, echinoderms, foraminifera, mollusks, siliceous sponges, brachiopods, corals, coccoliths). Castle Hayne stratigraphic units and associated diastemic surfaces originated from a series of marine depositional and diagenetic processes which, if uninterrupted, produced a hardground: deposition of a stratigraphic unit; non-deposition and induration; submarine erosion, exposure, boring, encrustation; deposition of a superjacent stratigraphic unit, non-deposition and induration of sub- and superjacent stratigraphic units. In subtidal areas crustiform glaucony/iron sul̨de and zeolites grew in microenvironments between indurated and overlying unindurated stratigraphic units. Pre-cursor orthochemical phosphate was developed by spreiten formers and opaque iron compounds formed through bacterial activity. Freshwater influenced the disconformity at the Eocene/Cretaceous boundary, but did not occur after formation of every Eocene diastemic surface. Freshwater diagenetic processes continue to modify the Castle Hayne Formation.
General note	Submitted to the faculty of the Department of Geology.
General note	Advisor: Scott W. Snyder
General note	Advisor: Lee J. Otte
Dissertation note	M.S. East Carolina University 1989
Bibliography note	Includes bibliographical references (leaves 235-254).
Genre/form	dissertations.
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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Petrography of unconfromable surfaces and associated stratigraphic units of the Eocene Castle Hayne Formation, southeastern North Carolina Coastal Plain / by LeAnn Kathleen Moran.

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