Holder Formation
| Holder Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Underlies | Bursum Formation |
| Overlies | Beeman Formation |
| Thickness | 850 ft (260 m) |
| Lithology | |
| Primary | Limestone |
| Other | Shale |
| Location | |
| Coordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named for | Holder Ridge |
| Named by | L.C. Pray |
| Year defined | 1954 |
  Holder Formation (the United States)  Holder Formation (New Mexico) | |
The Holder Formation is a geologic formation in the Sacramento Mountains of New Mexico. It preserves fossils dating back to the late Pennsylvanian.[1]
Description
[edit | edit source]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
[edit | edit source]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
[edit | edit source]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
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Footnotes
[edit | edit source]References
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