Ochoan


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Ochoan

[ō′chō·ən]
(geology)
A North American provincial series that is uppermost in the Permian, lying above the Guadalupian and below the lower Triassic.
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ON the day women's professional golf finally came to the men-only St Andrews club, world number one Lorena Ochoan shot a six-under 67 to take a two-shot first round lead in the Ricoh Women's British Open.
In the study area, the Alibates is underlain by red beds of the Permian (Guadalupian) Whitehorse Formation, and at most places is unconformably overlain by the Permian (Ochoan?) Quartermaster Formation, a red-bed interval very similar to the Whitehorse.
Dixon (1967) reviewed the problem of Alibates correlation and stated that the Quartermaster and Alibates could be either Guadalupian or Ochoan. The Texas Bureau of Economic Geology (Barnes 1969) mapped the Quartermaster, Alibates, and Whitehorse simply as a single undivided Permian-age formation.
-- Rare in the topmost Lamar but, according to Croft (1978), dominant in the basal Castile Formation at the very base of the Ochoan below the base of the hypersaline facies.