Geology of Killam deep test near Valentine, Jeff Davis County, Trans-Pecos, Texas

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Date

1954

Authors

Woodward, John Eylar, 1925-

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Abstract

The Killam deep test, located one mile northeast of Valentine, penetrated the thickest sequence of Tertiary volcanic rocks (more than 6,000 feet) known in Trans-Pecos Texas. The unusual thickness is attributed to deposition in a shallow basin that subsided throughout Tertiary time and to preservation in the structural low which was folded and faulted in late Tertiary time. Adjacent areas to the north and west were uplifted, while the basin near Valentine was downwarped. During the Quaternary period the basin received alluvial sediments from the nearby hills; more than 500 feet of alluvium was penetrated by the Killam well. Examination of well cuttings and thin sections of cuttings indicates eighteen volcanic units tentatively correlated with other volcanic rocks of the region.

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