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035 a| (Sirsi) o502149223;

035 a| (OCoLC)502149223;

043 a| n-us-nc;

049 a| EREE;

050 4 a| QE720.2.U6b| M33 2009;

100 1 a| McDowell, Katie L.,e| author.?| UNAUTHORIZED;

245 10 a| Holocene geologic development of central Hatteras flats and Buxton Beach ridges, Outer Banks, North Carolina /c| by Katie L. McDowell.;

264 0 c| 2009.;

300 a| 235 leaves :b| illustrations (some color), maps (some color) ;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| 2009;

500 a| Presented to the faculty of the Department of Geological Sciences.;

500 a| Advisor: David J. Mallinson;

500 a| Advisor: Stephen J. Culver;

520 3 a| The late Holocene evolution of the Hatteras Flats and Buxton beach ridges was reconstructed using sedimentological, micropaleontological, geophysical and chronostratigraphic data. Sixteen vibracores were collected from the Hatteras Flats and seven geoprobe cores were collected from the Buxton beach ridges. Geophysical data (ground penetrating radar and seismic surveys) were obtained throughout the study area to aid in paleoenvironmental reconstructions. Using ten lithofacies, five foraminiferal biofacies and geophysical data, five environmental facies were distinguished: low salinity estuary, high salinity estuary, normal marine salinity/FTD/submarine shoal, normal marine salinity/FTD/beachface and barrier island sand. Using these data, six cross-sections were constructed from transects across the Hatteras Flats and Buxton beach ridges. Normal marine salinity deposits comprised of foraminiferal species such as Hanzawaia strattoni, Quinqueloculina seminula, Quinqueloculina lamarckiana and Eponides řpandus were present in all sixteen vibracores between 1.5 and 8.5 m below MSL. High salinity estuarine deposits containing primarily Ammonia parkinsoniana and Ammotium salsum overlie the normal marine salinity unit in several cores, but are not always present. Low salinity estuarine deposits containing species such as Ammotium salsum and Elphidium excavatum occur in the surficial sediments of 15 of the 16 vibracores and represent conditions analogous to those of the modern day estuarine Hatteras Flats. Beach ridge sands barren of foraminifera capped normal marine salinity (upper shoreface) deposits in all of the cores from Buxton Woods. The upper shoreface units in the cores were represented in the ground penetrating radar data by seaward-dipping clinoforms interpreted as nearshore or shoreface deposits. As sea level was rising from approximately 4,000 to 2,500 yrs BP, the Hatteras Flats Interstream Divide was eroded to its modern depth of approximately 10 m below MSL in the Cape Hatteras region. Hatteras Island and the Buxton beach ridges formed (to the northeast of their modern position) resulting in estuarine conditions on the Hatteras Flats. An OSL age estimate from the northeastern portion of the Buxton beach ridges indicates that the beach ridges had prograded at least to the location of this core by approximately 1,600 yrs BP. Historic sea-level estimates interpreted from two Buxton beach ridge locations yielded similar results suggesting the modern elevation of berms within preserved shorelines are effective markers or index points of relative sea level. Micropaleontological, geophysical and chronostratigraphic data indicate that normal marine salinity conditions occurred over the Hatteras Flats in the study area approximately 1,100 yrs BP. Five OSL dates within normal marine salinity units gave age estimates ranging from 1,420 to 1,060 yrs BP, corresponding with a previously documented barrier island collapse in the southern Outer Banks. Hatteras Island was likely reduced in size by erosion of the beach ridges and the creation of large gaps in the barrier islands between Buxton and Hatteras Village and between Buxton and Avon. These conditions resulted in open bay environments on the Hatteras Flats. An OSL age estimate of 675 ± 180 yrs BP within this normal marine salinity unit indicates that marine water influenced the central Hatteras Flats for several hundred years. By 500 yrs BP, it is likely that the simple barrier islands near Cape Hatteras had reformed, returning estuarine conditions to the Hatteras Flats. An OSL age estimate indicates that a small inlet was present between Cape Hatteras and Avon 375 ± 60 yrs BP.;

504 a| Includes bibliographical references (leaves 145-158).;

650 0 a| Paleoecologyz| North Carolinay| Holocene.=| ^A43208;

650 0 a| Paleogeographyy| Holocene.=| ^A1017389;

651 0 a| Outer Banks (N.C.)=| ^A89466;

651 0 a| Hatteras Island (N.C.)=| ^A69729;

650 0 a| Lithofaciesz| North Carolina.=| ^A827062;

650 0 a| Foraminifera, Fossilz| North Carolina.=| ^A20576;

650 7 a| Foraminifera, Fossil.2| fast0| (OCoLC)fst00931565;

650 7 a| Holocene Geologic Period.2| fast0| (OCoLC)fst01353233;

650 7 a| Lithofacies.2| fast0| (OCoLC)fst01000253;

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

650 7 a| Paleogeography.2| fast0| (OCoLC)fst01051408;

648 7 a| From 10 thousand years ago2| fast;

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;

655 2 a| Academic Dissertation.0| (DNLM)D019478?| UNAUTHORIZED;

700 1 a| Mallinson, David J.,e| degree supervisor.?| UNAUTHORIZED;

700 1 a| Culver, Stephen J.,e| degree supervisor.1| https://id.oclc.org/worldcat/entity/E39PCjKrBJYmh8dmXyFxykwpyd=| ^A153086;

710 2 a| East Carolina University.b| Department of Geological Sciences.=| ^A1066239;

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/12597;

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

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

994 a| C0b| ERE;

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Holocene geologic development of central Hatteras flats and Buxton Beach ridges, Outer Banks, North Carolina / by Katie L. McDowell.

Author/creator	McDowell, Katie L. author.
Other author	Mallinson, David J., degree supervisor.
Other author	Culver, Stephen J., degree supervisor.
Other author	East Carolina University. Department of Geological Sciences.
Format	Theses and dissertations
Production	2009.
Description	235 leaves : illustrations (some color), maps (some color) ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Paleoecology--North Carolina. --Holocene. Paleogeography--Holocene. Lithofacies--North Carolina. Foraminifera, Fossil--North Carolina. Outer Banks (N.C.) Hatteras Island (N.C.)

Summary	The late Holocene evolution of the Hatteras Flats and Buxton beach ridges was reconstructed using sedimentological, micropaleontological, geophysical and chronostratigraphic data. Sixteen vibracores were collected from the Hatteras Flats and seven geoprobe cores were collected from the Buxton beach ridges. Geophysical data (ground penetrating radar and seismic surveys) were obtained throughout the study area to aid in paleoenvironmental reconstructions. Using ten lithofacies, five foraminiferal biofacies and geophysical data, five environmental facies were distinguished: low salinity estuary, high salinity estuary, normal marine salinity/FTD/submarine shoal, normal marine salinity/FTD/beachface and barrier island sand. Using these data, six cross-sections were constructed from transects across the Hatteras Flats and Buxton beach ridges. Normal marine salinity deposits comprised of foraminiferal species such as Hanzawaia strattoni, Quinqueloculina seminula, Quinqueloculina lamarckiana and Eponides řpandus were present in all sixteen vibracores between 1.5 and 8.5 m below MSL. High salinity estuarine deposits containing primarily Ammonia parkinsoniana and Ammotium salsum overlie the normal marine salinity unit in several cores, but are not always present. Low salinity estuarine deposits containing species such as Ammotium salsum and Elphidium excavatum occur in the surficial sediments of 15 of the 16 vibracores and represent conditions analogous to those of the modern day estuarine Hatteras Flats. Beach ridge sands barren of foraminifera capped normal marine salinity (upper shoreface) deposits in all of the cores from Buxton Woods. The upper shoreface units in the cores were represented in the ground penetrating radar data by seaward-dipping clinoforms interpreted as nearshore or shoreface deposits. As sea level was rising from approximately 4,000 to 2,500 yrs BP, the Hatteras Flats Interstream Divide was eroded to its modern depth of approximately 10 m below MSL in the Cape Hatteras region. Hatteras Island and the Buxton beach ridges formed (to the northeast of their modern position) resulting in estuarine conditions on the Hatteras Flats. An OSL age estimate from the northeastern portion of the Buxton beach ridges indicates that the beach ridges had prograded at least to the location of this core by approximately 1,600 yrs BP. Historic sea-level estimates interpreted from two Buxton beach ridge locations yielded similar results suggesting the modern elevation of berms within preserved shorelines are effective markers or index points of relative sea level. Micropaleontological, geophysical and chronostratigraphic data indicate that normal marine salinity conditions occurred over the Hatteras Flats in the study area approximately 1,100 yrs BP. Five OSL dates within normal marine salinity units gave age estimates ranging from 1,420 to 1,060 yrs BP, corresponding with a previously documented barrier island collapse in the southern Outer Banks. Hatteras Island was likely reduced in size by erosion of the beach ridges and the creation of large gaps in the barrier islands between Buxton and Hatteras Village and between Buxton and Avon. These conditions resulted in open bay environments on the Hatteras Flats. An OSL age estimate of 675 ± 180 yrs BP within this normal marine salinity unit indicates that marine water influenced the central Hatteras Flats for several hundred years. By 500 yrs BP, it is likely that the simple barrier islands near Cape Hatteras had reformed, returning estuarine conditions to the Hatteras Flats. An OSL age estimate indicates that a small inlet was present between Cape Hatteras and Avon 375 ± 60 yrs BP.
General note	Presented to the faculty of the Department of Geological Sciences.
General note	Advisor: David J. Mallinson
General note	Advisor: Stephen J. Culver
Dissertation note	M.S. East Carolina University 2009
Bibliography note	Includes bibliographical references (leaves 145-158).
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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