Loading...
Sediments and Shallow Stratigraphy of a Portion of the Continental Shelf of Southeastern Virginia
Hobbs, Carl H.
Hobbs, Carl H.
Abstract
A network of high-resolution, seismic-reflection profiles and grab samples of the surficial sediments of the inner continental shelf of southeastern Virginia demonstrate that the Quaternary geology of the region is more complex than indicated by earlier studies. The spatial variability of the surficial sediments depicts active processes, such as outflow from Chesapeake Bay, as well as the underlying geology in outcrops of finer grained sediments near False Cape. The complexity of the Quaternary geology results from large and small scale fluctuations in sea level. Individual, relatively large-scale, seismostratigraphic units are separated by erosional surfaces formed during the major changes in sea level that created the Cape Charles, iii iv Eastville, Belle Haven, and Exmore paleochannels in Chesapeake Bay. The low amplitude, high frequency variations in sea level that occurred during the midPleistocene impacted the inner shelf forming several thi~ depositional strata separated by local erosional surfaces. Substantial resources of sand exist on the inner shelf and are suitable for use in beach nourishment and construction aggregate. The deposits occur in three distinct stratigraphic settings: discrete shoals on the surface, filled channels, and laterally variable stratigraphic facies. The three types of filled paleochannels within the inner shelf have different origins: 1) riverine flow, 2) back-barrier or lagoonal channels, and 3) migration of (Holocene?) tidal inlets.
Description
Date
1997-08-01
Journal Title
Journal ISSN
Volume Title
Publisher
Collections
Download Dataset
Files
Rights Holder
Usage License
Embargo
Research Projects
Organizational Units
Journal Issue
Keywords
Physical Sciences Reports
Research and Technical Reports, Geology, Stratigraphic--Quaternary; Geology-- Virginia--Atlantic Coast; Sand--Virginia--Atlantic Coast; Marine sediments--Virginia--Atlantic Coast
Citation
Advisor
Department
Virginia Institute of Marine Science
DOI
https://doi.org/10.25773/6BZA-XK59