20 Analyses of samples from the Robinson property, San Miguel County, Colorado. • .. o • • • 0 0 0 0 0 0 o 0 o o • o o o o o 30 Detatled stratigz;aphic section of the Dolores formation a~ the Weatherly property , San Miguel County, Colorado • 0 0 0 40 Analyses of samples from the Weatherly property, San Miguel County, Colorado o • o o o o 0 •. • • o 0 0 • o o • o o o ., o • 50 Semi-quantitative spectrographic analyses of sele. cted pyrobitumen specimens, Weathedy property, San Miguel County, Colorado
Although none of the occurrences are large enough to constitute ore, uranium-bear ing hydrothermal solutions were probably present during Tertiary mineralization in the Bald Mountain area and may have given rise to the carnotite-type deposits in the sediments surrounding the Black Hills.
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