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Foraminifera in the Albemarle estuarine system, North Carolina; distribution and Recent environmental change

David J. Vance, Stephen J. Culver, D. Reide Corbett and Martin A. Buzas
Foraminifera in the Albemarle estuarine system, North Carolina; distribution and Recent environmental change
Journal of Foraminiferal Research (January 2006) 36 (1): 15-33


This study investigated the surface and subsurface distributions of foraminifera (both live populations and dead assemblages) throughout the Albemarle Estuarine System (AES) to determine the utility of the modern foraminiferal assemblages as models for paleoenvironmental interpretations in this estuarine and barrier island system. Thirty-seven species were recognized in the dead assemblages from 49 stations; 19 species comprised the living populations. Cluster analysis of the dead assemblages defined five biofacies: the calcareous foraminiferal nearshore marine and inlet biofacies, and the dominantly agglutinated foraminiferal estuarine shoal, estuary, inner estuary, and marsh biofacies. Paleoenvironmental reconstruction of three cores from the central Albemarle basin, based on the distribution of dead surface foraminiferal assemblages, recognized the inner estuarine and estuarine biofacies. Radionuclide tracers ( (super 210) Pb and (super 137) Cs) provided the geochronologic framework for each core. The westernmost core was capped by the inner estuarine biofacies overlying the estuarine biofacies, indicating either accumulation of a seasonal ephemeral layer of sediment from a lower brackish, upstream environment or increased freshwater discharge since the 1990's as a result of increased tropical storm and hurricane activity. The two easternmost cores indicated that, in the early 19th century, Albemarle Sound populations included calcareous foraminiferal species. These taxa were adapted to the higher salinities that resulted from several inlets that were open adjacent to the AES prior to 1828. Taphonomic processes (test transport, test dissolution, mechanical test breakage) are active but, with the exception of test dissolution in a relatively restricted geographic area, they do not significantly alter surficial foraminiferal assemblages in the transition into subfossil assemblages. Thus, foraminiferal distributions are useful for characterizing modern estuarine environments and for interpreting paleoenvironmental changes in sediments deposited over the past few hundred years in coastal North Carolina.

ISSN: 0096-1191
EISSN: 1943-264X
Serial Title: Journal of Foraminiferal Research
Serial Volume: 36
Serial Issue: 1
Title: Foraminifera in the Albemarle estuarine system, North Carolina; distribution and Recent environmental change
Affiliation: East Carolina University, Geology Department, Greenville, NC, United States
Pages: 15-33
Published: 200601
Text Language: English
Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States
References: 74
Accession Number: 2006-024983
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 2 plates, 4 tables, sketch map
N35°30'00" - N36°30'00", W76°45'00" - W75°30'00"
Secondary Affiliation: National Museum of Natural History, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200613
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