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003 OCoLC;

005 20250120151950.0;

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035 a| (Sirsi) o13305362;

035 a| (OCoLC)13305362;

043 a| n-us-waa| n-us-or;

049 a| EREE;

050 4 a| QE772b| .H34x 1985;

100 1 a| Hale, Walter R.,e| author.?| UNAUTHORIZED;

245 10 a| Application of a regression model in the determination of post-mortem transport of foraminiferal tests /c| by Walter R. Hale.;

264 0 c| 1985.;

300 a| 175 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| 1985;

500 a| "Presented to the faculty of the Department of Geology ... in partial fulfillment of the requirements for the degree Master of Science in Geology.";

500 a| Advisor: Scott W. Snyder;

520 3 a| Continental shelf surface sediments from Tillamook Head (northern Oregon) to Juan de Fuca Canyon (Washington) yielded 106 benthic foraminiferal species. Planktonic species are too rare to be considered important. Most specimens identified are agglutinated species, with calcareous species occurring primarily on the outer shelf. Species diversity generally increases with water depth, but low diversity values extend seaward near major submarine canyons. Eggerella advena is the most ubiquitous and abundant species. Cluster analysis of between-station faunal similarity reveals five major biofacies: 1) the inner shelf, where E. advena predominates with abundances of greater than 60% in all samples; 2) the middle shelf north of the Columbia River, predominated by E. advena (40-60%) and Spiroplectammina biformis (20-45%); 3) the middle shelf south of the Columbia River, where Recurvoides turbinatus, S. biformis and E. advena each compose 20-40% of the assemblage; 4) the middle to outer shelf, containing a more diverse assemblage including E. advena (20-40%), Adercotryma glomerata (5-20%), biformis (0-15%), Haplophragmoides bradyi (0-10%), Textularia earlandi (3-8%), and Uvigerina j͠ncea (5-20%); and 5) isolated patches on the outermost shelf, where U. juncea (20-35%) and Trifarina angulosa, A. glomerata and H. bradyi (each 5-15%) are the most abundant species. These major faunal associations are distributed parallel to isobaths and coincide closely with sediment-size patterns and accumulation-rate patterns for the region. A linear regression equation provided by Kontrovitz et al. was used to estimate traction velocity (Y) for each of the 31 most commonly occurring species. Values range from 4.1 to 13.3 cm/sec. Using Scheffe's method of multiple comparisons, species were separated into three groups. The species within each group are moved by velocities from the same statistical population. Nearly equidimensional forms are most easily transported (Y = 4.0 to 6.5 cm/sec); flattened-discoidal and elongate-compressed forms are most difficult to transport (Y > 10 cm/sec); forms of intermediate shape have intermediate traction velocities (Y = 6.5 to 10 cm/sec). Current-sorted assemblages would be expected to contain species with similar traction velocities, while unsorted assemblages should show a wide range of values. Each major biofacies identified contains common species with a broad range of Y values. This implies a lack of sorting and is consistent with data on bottom-current velocities in the study area. Sustained currents rarely exceed 10 cm/sec (usually during winter storms), and current direction is variable. The value of the regression method employed in this study is as a tool to be used in assessing post-mortem transport of foraminiferal tests, which could affect the reliability of paleoenvironmental interpretations.;

504 a| Includes bibliographical references (leaves 103-108).;

650 0 a| Foraminifera, Fossilz| Washington (State)=| ^A20576;

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

650 0 a| Sediment transportz| Washington (State)=| ^A20741;

650 0 a| Sediment transportz| Oregon.=| ^A20741;

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

650 7 a| Sediment transport.2| fast0| (OCoLC)fst01110959;

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/10342/11190;

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

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

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999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 226275-4001l| JNETm| JOYNERr| Ys| Yt| JNE3ETDu| 11/18/2024x| ETDz| JERESOURCE;

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Application of a regression model in the determination of post-mortem transport of foraminiferal tests / by Walter R. Hale.

Author/creator	Hale, Walter R. author.
Other author	Snyder, Scott W., degree supervisor.
Other author	East Carolina University. Department of Geology.
Format	Theses and dissertations
Production	1985.
Description	175 leaves : illustrations, maps ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Foraminifera, Fossil--Washington (State). Foraminifera, Fossil--Oregon. Sediment transport--Washington (State). Sediment transport--Oregon.

Summary	Continental shelf surface sediments from Tillamook Head (northern Oregon) to Juan de Fuca Canyon (Washington) yielded 106 benthic foraminiferal species. Planktonic species are too rare to be considered important. Most specimens identified are agglutinated species, with calcareous species occurring primarily on the outer shelf. Species diversity generally increases with water depth, but low diversity values extend seaward near major submarine canyons. Eggerella advena is the most ubiquitous and abundant species. Cluster analysis of between-station faunal similarity reveals five major biofacies: 1) the inner shelf, where E. advena predominates with abundances of greater than 60% in all samples; 2) the middle shelf north of the Columbia River, predominated by E. advena (40-60%) and Spiroplectammina biformis (20-45%); 3) the middle shelf south of the Columbia River, where Recurvoides turbinatus, S. biformis and E. advena each compose 20-40% of the assemblage; 4) the middle to outer shelf, containing a more diverse assemblage including E. advena (20-40%), Adercotryma glomerata (5-20%), biformis (0-15%), Haplophragmoides bradyi (0-10%), Textularia earlandi (3-8%), and Uvigerina j͠ncea (5-20%); and 5) isolated patches on the outermost shelf, where U. juncea (20-35%) and Trifarina angulosa, A. glomerata and H. bradyi (each 5-15%) are the most abundant species. These major faunal associations are distributed parallel to isobaths and coincide closely with sediment-size patterns and accumulation-rate patterns for the region. A linear regression equation provided by Kontrovitz et al. was used to estimate traction velocity (Y) for each of the 31 most commonly occurring species. Values range from 4.1 to 13.3 cm/sec. Using Scheffe's method of multiple comparisons, species were separated into three groups. The species within each group are moved by velocities from the same statistical population. Nearly equidimensional forms are most easily transported (Y = 4.0 to 6.5 cm/sec); flattened-discoidal and elongate-compressed forms are most difficult to transport (Y > 10 cm/sec); forms of intermediate shape have intermediate traction velocities (Y = 6.5 to 10 cm/sec). Current-sorted assemblages would be expected to contain species with similar traction velocities, while unsorted assemblages should show a wide range of values. Each major biofacies identified contains common species with a broad range of Y values. This implies a lack of sorting and is consistent with data on bottom-current velocities in the study area. Sustained currents rarely exceed 10 cm/sec (usually during winter storms), and current direction is variable. The value of the regression method employed in this study is as a tool to be used in assessing post-mortem transport of foraminiferal tests, which could affect the reliability of paleoenvironmental interpretations.
General note	"Presented to the faculty of the Department of Geology ... in partial fulfillment of the requirements for the degree Master of Science in Geology."
General note	Advisor: Scott W. Snyder
Dissertation note	M.S. East Carolina University 1985
Bibliography note	Includes bibliographical references (leaves 103-108).
Genre/form	dissertations.
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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Application of a regression model in the determination of post-mortem transport of foraminiferal tests / by Walter R. Hale.

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