Brobdignag Mine, Anvil Mountain, Red Mountain District, San Juan Co., Colorado, USA
|Latitude & Longitude (WGS84):||37° 50' 35'' North , 107° 42' 30'' West|
|Latitude & Longitude (decimal):||37.84306,-107.70833|
|Köppen climate type:||Dfc : Subarctic climate|
Ref: Dana 7:I:477; Rocks & Min.:63:274,287; The Mines and Minerals of the Great American Rift, R.W. Holmes & M.B. Kennedy, 1983.
Located northwest of the Zuni Mine on Anvil Mountain, and about 3 miles north of Silverton. This was the site of the first authenticated occurance of Zinkenite in the U.S.
9 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Miocene - Eocene|
5.333 - 56 Ma
|Cenozoic volcanic rocks|
Age: Cenozoic (5.333 - 56 Ma)
Stratigraphic Name: San Juan Mountains
Comments: Southern Rocky Mountains
Lithology: Intermediate-felsic volcanic rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
23.03 - 33.9 Ma
|Intra-ash flow andesitic lavas|