In the valley of the North Canadian River in Okfuskee County, Oklahoma, the writer has recently observed two exposures of volcanic ash beneath the alluvial deposits of unconsolidated sand and loam that spread over the uplands bordering the present course of the river.
One of these exposures is in the southwest quarter section 25, T. 10 N., R. 9 E., and the other in the southeast quarter section 19, T. 10 N.,R. 10 E. At both places the ash has been mined to some extent and used in Okmulgee and Tulsa as a filler in the paint industry. It is...
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