Radiocarbon tests date the Ben Franklin local fauna as Wisconsin, and the Clear Creek local fauna as Sangamon. The contrast between the mollusks of these two faunas is remarkable, as shown by the following table.
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Cheatum, E. P. and Allen, Don
"An Ecological Comparison of the Ben Franklin and Clear Creek Local Molluscan Faunas in Texas,"
Journal of the Graduate Research Center: Vol. 31:
3, Article 6.
Available at: https://scholar.smu.edu/journal_grc/vol31/iss3/6