Abstract

The Raton basin, Colorado-New Mexico, was formed in Early Pennsylvanian time when downwarping produced geosynclinal basins bordered on the west by the San Luis uplift. The border zone was uplifted in early and middle Tertiary time to form the Sangre de Cristo uplift; then in middle and late Tertiary time the San Luis uplift was tilted eastward, and the eastern part foundered to form the San Luis basin. Still mainly untested, the Raton basin offers petroleum possibilities where thick Pennsylvanian and Cretaceous marine sediments may be source rocks and potential structural and stratigraphic traps are known to exist. Tertiary and Quaternary terrestrial sediments and interbedded volcanics in the San Luis basin discourage oil exploration.

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