Finlay Limestone
Finlay Limestone | |
---|---|
Stratigraphic range: | |
![]() 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 | 31°22′N 105°36′W / 31.36°N 105.60°W |
Region | New Mexico Texas Chihuahua |
Country | United States Mexico |
Type section | |
Named for | Finlay Mountains |
Named by | G.B Richardson |
Year defined | 1904 |
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
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 (31°22′N 105°36′W / 31.36°N 105.60°W),[1] the Sierra de Juarez,[3] and the Cerro de Cristo Rey uplift (31°47′13″N 106°32′46″W / 31.787°N 106.546°W).[2] The formation overlies the Cox Sandstone[1] and is overlain by the Del Norte Formation.[2]
Fossils
The formation is highly fossiliferous, containing fossils characteristic of early Cretaceous Albian and Comanchean age.[2]
Economic resources
The formation includes carbonate replacement deposits of lead, zinc, and silver in northern Mexico, along the Chihuahua CRD belt.[4]
History of investigation
The formation was first defined by G.B. Richardson in 1904 and assigned to the Fredericksburg Group.[1]
See also
Footnotes
References
- Kottlowski, F.E. (1973). "Pre-Pliocene rocks in La Mesa region, southern Dona Ana County, New Mexico". El Paso Geological Society Field Trip Guidebook. 7: 37–46.
- Lovejoy, E.M.P. (1976). "Geology of Cerro de Cristo Rey uplift, Chihuahua and New Mexico" (PDF). New Mexico Bureau of Mines and Mineral Resources Memoir. 31. Retrieved 3 August 2020.
- Richardson, G.B. (1904). "Report of a reconnaissance in Trans-Pecos Texas north of the Texas and Pacific Railway". University of Texas, Mineral Survey Bulletin. 9.