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Stratigraphic units selected for mapping in the Midland Basin were
adapted from cross sections and stratigraphic studies (Adams, 1944;
1968; Herald, 1957; Humble Oil and Refining, 1960; 1964a; 1964b;
Tait and others; 1962; Feldman, 1962; Vertrees, 1962; 1963; Snider,
1966; McKee and others, 1967; Mear, 1968; Johnson, 1978; Presley,
1981; Matchus and Jones, 1984; Borns and Shaffer, 1985; McGookey
and others, 1988; Hovorka, 1990). The Ochoan Dewey Lake, Alibates,
and Salado Formations; and Guadalupian Tansill, Yates, and Seven
Rivers Formations are readily identified in the Midland Basin and
across the Central Basin Platform. Complex changes in the character
and thickness of stratigraphic units reflecting the results of both
facies changes and salt dissolution are noted near and across the
west margin of the Central Basin Platform/east margin of the Delaware
Basin. The Seven Rivers, Yates, and Tansill Formations are laterally
equivalent to the Capitan Limestone Reef facies that forms the aggradational
and progradational shelf margin of the Delaware Basin. Within the
Delaware Basin, stratigraphic units are the Ochoan Rustler, Salado,
and Castile Formations and the Guadalupian Bell Canyon Formations.
Log analysis and preparation of cross sections, supplemented by
core and outcrop descriptions, show the lithologies and facies relationships
in each of these units.
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