Carbonaceous and Ordovician rocks cut on Southern railway half a mile east of Calera. Shelby County, Alabama. 1924.
Dates
Date Taken
1924
Summary
Carbonaceous and Ordovician rocks cut on Southern railway half a mile east of Calera. The Athens shale (Ordovician) is overlain by the Frog Mountain sandstone (Devonian), 4 inches thick; clay that may be of Devonian age in the middle; and Fort Payne chert (Mississippian) at the right. There is a great stratigraphic break between the Frog Mountain sandstone and Athens shale. Looking northeast. Shelby County, Alabama. 1924. Plate 10 in U.S. Geological Survey. Folio 226. 1940.
Summary
Carbonaceous and Ordovician rocks cut on Southern railway half a mile east of Calera. The Athens shale (Ordovician) is overlain by the Frog Mountain sandstone (Devonian), 4 inches thick; clay that may be of Devonian age in the middle; and Fort Payne chert (Mississippian) at the right. There is a great stratigraphic break between the Frog Mountain sandstone and Athens shale. Looking northeast. Shelby County, Alabama. 1924. Plate 10 in U.S. Geological Survey. Folio 226. 1940.
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