Fossil fresh-water and land mollusks are described from a Pleistocene alluvial deposit near Byers, in Clay County, Texas-an ancient lake-bed formed by an ox-bow cut-off during the meandering of the Red River. Using as indicators recognized faunas which are identified with known geological ages in the mid-continent region of the United States, a comparative study chart and vertical-range graph were made of the Byers shells to determine age of deposition. This comparative-study method dated the shell deposit back to an Illinoian age. The molluscan fauna indicates during this time a more humid and cooler climate without the summer high temperatures which prevail in the same area today.
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Allen, Don and Cheatum, E. P.
"A Pleistocene Molluscan Fauna Near Byers, Clay County, Texas,"
Journal of the Graduate Research Center: Vol. 29:
3, Article 1.
Available at: https://scholar.smu.edu/journal_grc/vol29/iss3/1