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Keywords: EdwardsDisconformity.jpg en Disconformity in which the Edwards Formation Lower Cretaceous lies upon a Lower Permian limestone in Texas The hiatus is approximately 165 million years Own Wilson44691 2008-12-15 Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html Unconformities in the United States Limestone samples Geology of Texas |