Abstract

The thick section of the Bird Spring Group near Lee Canyon, Clark County, Nevada, consists of more than 7000 ft of predominantly carbonate strata which are subdivided as follows: Chesterian (125+ or -ft), Morrowan (775+ or -ft), Atokan (510+ or -ft), Des Moinesian (520 + or -ft), Missourian (145+ or -ft), Virgilian (525+ or -ft), Wolfcampian (3075+ or -ft), and Leonardian (1525+ or -ft). The upper limits of the group could not be determined because of truncation by faulting. A petrographic study was made on the Bird Spring Group near Lee Canyon, and, for descriptive purposes, a classification of carbonate rocks was modified from several existing classifications. That classification is used in this paper.

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