Pequanac shale. Introduced to replace "Monroe shale" [preoccupied] of reports of the New Jersey Geol. Survey. Extensively developed along upper Pequanac [Pequannac] River. Thickness 1,000 feet. Overlies Kanouse sandstone. Contains Hamilton fossils.
Source: US geologic names lexicon (USGS Bull. 896, p. 1638).
Cornwall shale having been published in 1907, as a name to replace "Monroe shales" in New York, the name "Pequanac" was in 1914 (USGS Raritan folio, no. 191) discarded in favor of Cornwall shale, now [ca. 1938] in use in both States.
Source: US geologic names lexicon (USGS Bull. 896, p. 1638).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
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