Earth and Planetary Sciences ETDs

Publication Date



The Rita Blanca lake deposits in the northwestern part of the panhandle of Texas have been dated as Blancan age by vertebrate remains. During maximum development, Rita Blanca lake probably had an elliptical shape with a length of about 6 miles and breadth of about 3 1/2 miles.

The subject of this report is the petrology and paleontology of a 4 1/2-foot laminated clay bed of Blancan age low in the exposed Rita Blanca lake deposit of Hartley County, Texas. The main purpose is to determine the paleoecology, in particular the nature of the climatic regime which prevailed during deposition of this bed.

Degree Name

Earth and Planetary Sciences

Level of Degree


Department Name

Department of Earth and Planetary Sciences

First Committee Member (Chair)

Roger Yates Anderson

Second Committee Member

Stuart Alvord Northrop

Third Committee Member

J. Paul Fitzsimmons



Document Type


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Figure 28. Differential thermograms of the Rita Blanca varved section graphically showing the cyclic changes in lithology with time.

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Figure 29. Smoothed curve showing variation of color index with time.

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Figure 35 and 36. Absolute rate of calcium carbonate deposition and absolute rate of clay deposition.

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Geology Commons