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Bar B Formation
Geologic formation in New Mexico, US From Wikipedia, the free encyclopedia
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The Bar B Formation is a geologic formation found the Caballo Mountains of New Mexico. It preserves fossils showing it was deposited in the middle to late Pennsylvanian.[1][2]
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Description
The Bar B formation is mostly cyclic[2] beds of shale and limestone, with shale making up about 80% of the formation and limestone the other 20%. Chert is present in some of the limestone. The upper 50 feet (15 m) include reddish-brown siltstone, limestone conglomerate, and calcareous siltstone. The total thickness is about 339 ft (103 m).[3] The formation rests on the Nakaye Formation and is unconformably overlain by the Bursum Formation.[2]
The formation likely correlates with the Panther Seep Formation in the San Andres Mountains.[1][2]
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Fossils
History of investigation
The formation was first defined by V.C.Kelley and Caswell Silver in 1952.[3] Bachman and Myers criticized its definition in 1975,[1] but it is accepted by Kues and Giles, though they restrict it to the Caballo Mountains.[2]
See also
References
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