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Dolly B Mine, Leadville District (California District), Lake Co., Colorado, USA

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Latitude & Longitude (WGS84): 39° 15' 27'' North , 106° 13' 17'' West
Latitude & Longitude (decimal): 39.25751,-106.22153
GeoHash:G#: 9wurqfegd
Other regions containing this locality:Rocky Mountains, North America
Locality type:Mine
Köppen climate type:Dfc : Subarctic climate

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Mineral List

2 valid minerals.

Regional Geology

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

Permian - Devonian
252.17 - 419.2 Ma

ID: 3187583
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 419.2 Ma)

Lithology: Sedimentary 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. [154]

298.9 - 323.2 Ma

ID: 2854241
Minturn Fm in west-central and south-central and other units

Age: Pennsylvanian (298.9 - 323.2 Ma)

Stratigraphic Name: Minturn Formation

Description: Arkosic sandstone, conglomerate, shale, and limestone. Includes Madera Fm and Sharpsdale Fm of Chronic (1958) in Sangre de Cristo Range and Gothic Fm of Langenheim (1952) in Elk Mountains. Other units of Middle Pennsylvanian age.

Lithology: Major:{arkose,conglomerate,shale}, Minor:{limestone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Middle Pennsylvanian
307 - 315.2 Ma

ID: 3302460
Minturn Formation

Age: Pennsylvanian (307 - 315.2 Ma)

Stratigraphic Name: Minturn Formation

Description: The upper 550 to 900 m are similar to the Maroon Formation and consist mostly of thinly bedded and laminated, reddish, and variegated arkosic and micaceous sandstone and siltstone, with minor shale (locally calcareous or gypsiferous) (Houck and others, 2012). Sandstone is mostly fine grained but unit contains local lenses of medium- to coarse-grained sandstone. Calcareous horizons are as thick as 100 m. Common well-indurated siltstones tend to be quartz rich. Ripple cross-lamination, mud cracks, shale rip-up clasts, raindrop impressions, and land-plant debris are particularly common in the calcareous horizons (Widmann and others, 2011). The uppermost approximately 70 m of the Minturn Formation is composed mostly of calcareous and gypsiferous shale, probably equivalent to the Jacque Mountain Limestone Member, which is the uppermost member of the formation and defined as an oolitic limestone by Tweto and Lovering (1977) near Minturn, about 25 km north of the map area. Consequently, the top of the unit is defined at the top of the highest calcareous bed. The middle 650–1,000 m contains the above lithologies in addition to micritic limestone and dolomite beds, gypsiferous shale, and gypsiferous sandstone (Houck and others, 2012). The lower 125 m typically contains dark-gray shale and fine- to coarse-grained, arkosic, micaceous sandstone; black, phosphatic fish coprolites as long as 2 cm are locally observed. The lower part in the Marmot Peak quadrangle (Houck and others, 2012), and the lowest part immediately above the Belden Formation (*b) in the Jones Hill quadrangle (Widmann and others, 2011) contain quartz-pebble conglomerate, quartz-feldspar sandstone, and interberbedded black shale and thin limestone beds that are laterally equivalent to the Coffman Member of the Minturn, as described near Trout Creek Pass (Gould, 1935; De Voto and Peel, 1972; Wallace and Keller, 2003). The Belden-Minturn contact is drawn at the base of prominent, ridge-forming sandstone overlying the mostly black fissile shale of the Belden. The Belden-Minturn sequence was formerly called the Weber Formation (Emmons, 1898; Behre, 1953)

Reference: Kellogg, K.S., R.R. Shroba, C.A. Ruleman, R.G. Bohannon, W.C. McIntosh, W.R. Premo, M.A. Cosca, R.J. Moscati, T.R. Brandt. Geologic map of the upper Arkansas River valley region, north-central Colorado. doi: 10.3133/sim3382. U.S. Geological Survey Scientific Investigations Map 3382. [186]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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