Collections of Chara oogonia from late Pleistocene alluvium beneath the floodplain of the North Fork of the Sulphur River near Ben Franklin (Delta County), and from the second terrace above Clear Creek (Denton County) were studied. The radiocarbon dates of the Sulphur River deposits are 10,000-11,000 B.P., while those of the Clear Creek deposits are about 28,000 B.P.
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Schlichting, Harold E. Jr.
"Charophytes of Pleistocene Age from Delta and Denton Counties, Texas,"
Journal of the Graduate Research Center: Vol. 31:
3, Article 7.
Available at: https://scholar.smu.edu/journal_grc/vol31/iss3/7