Section of Bluffs on Rio Seco, April 19, 1855.
1. Sub-soil. 2. Diluvium. 3. White Chalk with Flints. 4. Marly Blue Clay with thin seams of Limestone Interstratified.

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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