Age and correlation of the Clinchfield Sand in Georgia
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Geology topics
Publications and source records attributed to Stephen M. Herrick.
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Both megafossils and fossil Foraminifera have been obtained from unconsolidated sediments of the Wicomico Formation , which underlies the Penholoway terrace, a coastal feature that formed when the shoreline of the Atlantic Ocean stood about 70 feet higher than at present. Some of the fossils are Tertiary species and are assumed to have been derived from rocks of that age; the others are species commonly found in near-shore deposits of Quaternary age as well as in present-day south -Atlantic coastal waters. The Penholoway terrace in this area is shown to have been formed during a pause in marine regression from the Wicomico stand, when the sea stood near 100 feet. The relation of the Wicomico and Penholoway terraces to other coastal terraces suggests a Yarmouth age for the fossil -yielding beds.
The purpose of this investigation which is being made in cooperation with the Georgia Department of Mines, Mining and Geology, Chatham County, and the City of Savannah, is to determine whether salt-water encroachment has occurred in the principal limestone aquifer in the Savannah area, and, if so, to delimit the extent of the encroachment vertically and laterally. The drilling of two test wells, which constitutes the initial part of the investigation, was done in April, May, and June, 1954. This interim report describes the subsurface geology in the Savannah area and reports the results of water samples taken during the test drilling. The investigation is being continued by M. A. Warren and F. B. Hudson of the U.S. Geological Survey, and later results will be given in a subsequent report.
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