Iron ore diggings at Shelby. Ore is in pockets in decayed rock, which is reported to extend nearly 100 feet below the bottom of the pit. The clay seems to be fill and ancient sink hole. Shelby County, Alabama. 1924. Plate 15 in U.S. Geological Survey. Folio 226. 1940.
Summary
Iron ore diggings at Shelby. Ore is in pockets in decayed rock, which is reported to extend nearly 100 feet below the bottom of the pit. The clay seems to be fill and ancient sink hole. Shelby County, Alabama. 1924. Plate 15 in U.S. Geological Survey. Folio 226. 1940.
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