Abstract

This reconnaissance investigation of cross-bedding directions reveals that Upper Triassic sediments in northeastern New Mexico may have had their source in positive areas on the S. and SE. An alternative interpretation of the data shows that sediment contributions from S.-central Colorado, a presumed major source area, cannot be completely ruled out, but it appears that the S.-central Colorado area was not a chief source of supply. An expansion of cross-bedding studies in conjunction with detailed petrographic analysis of the Dockum sandstones would probably clarify the problem of types and sources of sediment for these beds during Late Triassic time.

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