Bar B Formation

Bar B Formation
Bar B Formation
Stratigraphic range: middle Pennsylvanian–late Pennsylvanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Formation
Underlies	Bursum Formation
Overlies	Nakaye Formation
Thickness	339 ft (103 m)
Lithology
Primary	Limestone, shale
Location
Coordinates	33°01′07″N107°14′20″W / 33.0185°N 107.2390°W
Region	New Mexico
Country	United States
Type section
Named for	Barbee Draw (drainage)
Named by	V.C. Kelley and Caswell Silver
Year defined	1952
	Bar B Formation (the United States) Bar B Formation (New Mexico)

Last updated February 15, 2024

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]

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]

Fossils

The formation contains abundant bryozoan fossils.^[3]

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]

Related Research Articles

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References

1 2 3 Bachman, G.O.; Myers, D.A. (1975). "The Lead Camp Limestone and its correlatives in south-central New Mexico" (PDF). New Mexico Geological Society Field Conference Guidebook. 26: 105–108. Retrieved 30 July 2020.
1 2 3 4 5 Kues, B.S.; Giles, K.A. (2004). "The late Paleozoic Ancestral Rocky Mountain system in New Mexico". In Mack, G.H.; Giles, K.A. (eds.). The geology of New Mexico. A geologic history: New Mexico Geological Society Special Volume 11. pp. 95–136. ISBN 9781585460106.
1 2 3 Kelley, V.C.; Silver, Caswell (1952). "Geology of the Caballo Mountains; with special reference to regional stratigraphy and structure and to mineral resources, including oil and gas". University of New Mexico Publications in Geology. 4.

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[bachman-myers-1975-1] 1 2 3 Bachman, G.O.; Myers, D.A. (1975). "The Lead Camp Limestone and its correlatives in south-central New Mexico" (PDF). New Mexico Geological Society Field Conference Guidebook. 26: 105–108. Retrieved 30 July 2020.

[kues-giles-2004-2] 1 2 3 4 5 Kues, B.S.; Giles, K.A. (2004). "The late Paleozoic Ancestral Rocky Mountain system in New Mexico". In Mack, G.H.; Giles, K.A. (eds.). The geology of New Mexico. A geologic history: New Mexico Geological Society Special Volume 11. pp. 95–136. ISBN 9781585460106.

[kelley-caswell-1952-3] 1 2 3 Kelley, V.C.; Silver, Caswell (1952). "Geology of the Caballo Mountains; with special reference to regional stratigraphy and structure and to mineral resources, including oil and gas". University of New Mexico Publications in Geology. 4.

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