The section extends from Shell-Kirby University No. 1 in Pecos County to Sloan & Smith Lovern No. 1 in Roosevelt County, New Mexico. The first eighteen wells along the western part of the Central Basin platform show the generally accepted interpretation of reef production in the Whitehorse formation of Ward and Winkler counties, Texas, and southeastern Lea County, New Mexico. The section shows also the reef and the lagoonal facies of the Whitehorse and attendant production. North of the Vacuum pool of Lea County, the transition from predominantly dolomitic deposition to the broken anhydrite, salt and sand facies of the Whitehorse and San Andres formations in Roosevelt County, New Mexico, is shown.

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