Thin deposits of sandy clay, sand, gravel, and caliche lie on the Cretaceous and Tertiary formations in extensive areas of the Coastal Plain of Texas. One portion of these deposits has been named the Reynosa formation by Trowbridge (FOOTNOTE 3) and Deussen,(FOOTNOTE 4) and another, the Lissie formation by Deussen.(FOOTNOTE 5) Previously, the name Reynosa was given by Penrose (FOOTNOTE 6) to the caliche deposits at Reynosa, Tamaulipas, Mexico, and vicinity; and the name Uvalde was given by Hill (FOOTNOTE 7) to the gravel and associated deposits typically displayed on the highest terraces in Uvalde County and vicinity. Later, Trowbridge (FOOTNOTE 8) included the Uvalde formation in the Reynosa formation and dropped the name Uvalde.

This paper is a brief review of the literature on the Uvalde and other up-dip terrace deposits, the Reynosa, and the Lissie formations; a description of the type section of each of these formations; an outline of the areas to which these type sections apply; an attempt to correlate these deposits; and a brief discussion of their probable origin.

Also, brief descriptions are given of the Catahoula, Oakville, and Lagarto formations, which underlie the Lissie and Reynosa deposits, and of the Beaumont clay, which overlies the Lissie.

FOOTNOTE 3. A. C. Trowbridge, "A Geologic Reconnaissance in the Gulf Coastal Plain of Texas Near the Rio Grande," U. S. Geol. Survey Prof. Paper 131-D (1923), pp. 98-99.

FOOTNOTE 4. Alexander Deussen, "Geology of the Coastal Plain of Texas West of Brazos River," U. S. Geol. Survey Prof. Paper 120 (1924), p. 102.

FOOTNOTE 5. Ibid., p. 108.

FOOTNOTE 6. R. A. F. Penrose, Jr., "A Preliminary Report on the Gulf Tertiary of Texas from Red River to the Rio Grande," Texas Geol. Survey 1st Ann. Rept. (1890), p. 63.

FOOTNOTE 7. R. T. Hill, "Notes on the Geology of the Southwest," Amer. Geol., Vol. 7 (1891), pp. 367-68.

FOOTNOTE 8. A. C. Trowbridge, op. cit.

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