Two types of refractory clayrock from the Van Bibber Shale Member of the South Platte Formation. Douglas County, Colorado. 1952.
Dates
Date Taken
1952
Summary
Two types of refractory clayrock from the Van Bibber Shale Member of the South Platte Formation. Refractory claystone from the Helmer Claystone bed. Douglas County, Colorado. 1952. Published as plate 3-B in U.S. Geological Survey Bulletin 1102. 1961.
Summary
Two types of refractory clayrock from the Van Bibber Shale Member of the South Platte Formation. Refractory claystone from the Helmer Claystone bed. Douglas County, Colorado. 1952.
Published as plate 3-B in U.S. Geological Survey Bulletin 1102. 1961.
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