Section of Strata on Medina River, April 27, 1855.
1. Detritus. 2. Cretaceous Limestone. 3. Blue Shale.

from

A PARTIAL REPORT ON THE GEOLOGY OF WESTERN TEXAS CONSISTING OF A GENERAL GEOLOGICAL REPORT AND A Journal of Geological Observations along the Routes Traveled by the Expedition between Indianola, Texas, and the Valley of the Mimbres, New Mexico, during the Years 1855 and 1856; with an Appendix giving a Detailed Report on the Geology of Grayson County.
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