Spechts Ferry Shale member (Ods) of Decorah Formation, Dubuque County, Iowa, 1949.
Dates
Date Taken
1949
Summary
Type section of Spechts Ferry Shale member (Ods) of Decorah Formation overlain by Guttenberg Limestone member (Odg overhang); underlain by McGregor Limestone member (Opm) of Platteville Formation in quarry 200 yards southeast of Spechts Ferry station. Dubuque County, Iowa. ca 1949. Published in U.S. Geological Survey, Professional paper 274-K, Figure 47, p.286. 1956.
Summary
Type section of Spechts Ferry Shale member (Ods) of Decorah Formation overlain by Guttenberg Limestone member (Odg overhang); underlain by McGregor Limestone member (Opm) of Platteville Formation in quarry 200 yards southeast of Spechts Ferry station.
Dubuque County, Iowa. ca 1949.
Published in U.S. Geological Survey, Professional paper 274-K, Figure 47, p.286. 1956.
Image located in the U.S.Geological Survey Photographic Collection, Allen Francis Agnew Collection Album, no.7.
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