Finlay Limestone
| Finlay Limestone | |
|---|---|
| Stratigraphic range: | |
| File:Finlay Formation.jpg Limestone mountains of Finlay Limestone in Aquiles Serdán Municipality near Chihuahua City. | |
| Type | Formation |
| Unit of | Fredericksburg Group |
| Underlies | Del Norte Formation |
| Overlies | Cox Sandstone |
| Thickness | 130–426 feet (40–130 m) |
| Lithology | |
| Primary | Limestone |
| Other | Sandstone |
| Location | |
| Coordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | New Mexico Texas Chihuahua |
| Country | United States Mexico |
| Type section | |
| Named for | Finlay Mountains |
| Named by | G.B Richardson |
| Year defined | 1904 |
Finlay Limestone (the United States) Finlay Limestone (Texas) | |
The Finlay Limestone is a geologic formation in western Texas, southern New Mexico, and northern Chihuahua. It preserves fossils dating back to the early Cretaceous period.[1][2]
Description
[edit | edit source]The formation is composed of massive gray limestone with a few thin beds of brown sandstone, with a total thickness of 130–426 feet (40–130 m).[1][2] It is exposed in the Finlay Mountains (Lua error: callParserFunction: function "#coordinates" was not found.),[1] the Sierra de Juarez,[3] and the Cerro de Cristo Rey uplift (Lua error: callParserFunction: function "#coordinates" was not found.).[2] The formation overlies the Cox Sandstone[1] and is overlain by the Del Norte Formation.[2]
Fossils
[edit | edit source]The formation is highly fossiliferous, containing fossils characteristic of early Cretaceous Albian and Comanchean age.[2]
Economic resources
[edit | edit source]The formation includes carbonate replacement deposits of lead, zinc, and silver in northern Mexico, along the Chihuahua CRD belt.[4]
History of investigation
[edit | edit source]The formation was first defined by G.B. Richardson in 1904 and assigned to the Fredericksburg Group.[1]
See also
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Footnotes
[edit | edit source]References
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