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Holder Formation
From Wikipedia, the free encyclopedia
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The Holder Formation is a geologic formation in the Sacramento Mountains of New Mexico. It preserves fossils dating back to the late Pennsylvanian.[1]
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Description
The Holder Formation consists of limestone, red and gray calcareous shale, sandstone, and conglomerate. The maximum thickness is 850 ft (260 m).[1] The formation overlies the Beeman Formation[1] and is overlain by the Laborcita Formation.[2]
The formation is interpreted as a shallow-shelf marine formation of Virgilian (latest Pennsylvanian) age[3] during a global ice age.[4]
Fossils
Bioherms are present at the base of the formation.[1] These are up to 50–75 feet (15–23 meters) thick.[3] They are composed of uncalcified cup-shaped phylloid (leaf-like[5]) algae surrounded by masses of beresellid algae.[4]
History of investigation
The unit was first named by Lloyd C. Pray in 1954[1] and a type section was designated in 1959.[6] Pray originally assigned the formation to the Magdalena Group, but the Magdalena Group has subsequently been abandoned.[3][2]
See also
Footnotes
References
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