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Related Experiment Video

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Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea

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Published on: September 5, 2018

Ancient Oyster Shells on the Atlantic Continental Shelf.

A S Merrill, K O Emery, M Rubin

Science (New York, N.Y.)

|January 22, 1965

Summary

Fossilized American oysters (Crassostrea virginica) found at significant depths suggest ancient lagoons were submerged by rising sea levels. These findings date back 8,000 to 11,000 years, following the last glacial period.

Area of Science:

Paleontology
Marine Biology
Quaternary Geology

Background:

The American oyster, Crassostrea virginica, typically inhabits shallower estuarine environments.
Understanding past sea-level changes is crucial for coastal ecosystem studies.

Purpose of the Study:

To investigate the paleoenvironment of Crassostrea virginica based on fossil shell distribution.
To determine the age of ancient oyster populations and their relation to sea-level fluctuations.

Main Methods:

Systematic sampling of fossil oyster shells across 71 stations.
Radiocarbon dating (¹⁴C) of collected Crassostrea virginica shells.

Main Results:

Oyster shells were found at depths ranging from 14 to 82 meters.

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Radiocarbon dating placed the age of the oysters between 8,000 and 11,000 years before present.

The depths at which shells were found exceed typical modern estuarine habitats for this species.

Conclusions:

The Crassostrea virginica shells indicate the presence of submerged lagoons or estuaries.
These ancient environments were inundated due to sea-level rise after the last glacial epoch.
The findings provide evidence for significant Quaternary sea-level changes in the study region.