Related Experiment Video
Updated: Jul 11, 2026
07:20
Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea
Published on: September 5, 2018
Ancient Oyster Shells on the Atlantic Continental Shelf
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.
- 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.
Related Concept Videos
01:27Diversity of Protists III
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
02:56The Fossil Record
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
01:22Effect of Sea Water on Concrete
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks, which undergo...
Concrete in areas between tide marks, which undergo...
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
01:23Surface Appendages of Archaea
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...