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Leadville Limestone

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Leadville Limestone
Stratigraphic range: Carboniferous
Silver-replaced gastropod in fossiliferous limestone (Leadville Limestone; Aspen, Colorado)
TypeFormation
Sub-unitsCastle Butte Member, Red Cliff Member, Yule Marble (informal)
UnderliesMolas Formation
OverliesChaffee Formation
Thickness220 feet (Marble Quadrangle, CO)
Location
RegionWestern U.S.
CountryUnited States
ExtentAZ, CO, NM, UT[1]
Type section
Named forLeadville, Colorado
Outcrop in the Uncompahgre Gorge with key geological formations], including the Ouray Formation, Elbert Formation, and the Leadville Limestone

The Leadville Limestone is a Mississippian geologic formation in the western United States.[2] In Colorado, the upper part is oolitic limestone, while the lower part is primarily dolomite, and somewhat sandy beds indicate the bottom of the formation.

The formation is sparsely fossiliferous but contains many calcareous algae, Foraminifera (Endothyra), sponges, corals (Syringopora), Bryozoa, many brachiopods, gastropods (Bellerophon, Straparolus), Cephalopoda, fragments of ostracods, abundant fragments of crinoids, echinoid spines, and teeth of fish.[3]

A metamorphic facies of this formation is known as the Yule Marble and has been quarried for construction materials.

See also

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References

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  1. ^ Leadville, National Geologic Map Database, Geolex — Unit Summary. Last update: 6 August 2020
  2. ^ Geologic map of the Marble quadrangle, Gunnison and Pitkin Counties, Colorado, Gaskill, D.L., and Godwin, L.H., 1966. USGS Geologic Quadrangle Map GQ-512. Map Scale: 1:24,000.
  3. ^ Geology of Glenwood Springs Quadrangle and Vicinity, Northwestern Colorado, By N. Wood Bass and Stuart A. Northrop, 1963. GEOLOGICAL SURVEY BULLETIN 1142-J. pp. J26-J29.