ABSTRACT

Discovery is announced of reef bodies in the Ogallala cap rock on the Llano Estacado Plateau of New Mexico and Texas, similar to those previously described by Elias from a limestone in the same position in Kansas and elsewhere on the Northern High Plains.

The characteristic concretionary structure of the reefs is widely but not universally repeated—with and without observed reef bodies—in the upper part of the Ogallala cap rock, and in post-Ogallala limestone cap rocks of basin deposits of the plateau and of the Mescalero pediment between the plateau and Pecos River.

A syngenetic origin for many of the banded concretionary bodies is preferred, while the formerly advanced post-depositional hypothesis of Price may apply to others.

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