GEOLEX

Summary of Citation: Sawatch

Publication:
Eldridge, G.H., 1894, Description of the sedimentary formations:
   U.S. Geological Survey Geologic Atlas of the United States,
   Anthracite-Crested Butte folio, no. 9, p. 6-10

Usage in Publication:
Sawatch quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Named	Eagle basin	Quartzite

Summary:
Named for persistent occurrence around flanks of Sawatch Range, Pitkin Co, CO in the Eagle basin. No type locality designated. Lower division consists of 50 to 200 ft of white quartzite that has a persistent white quartz conglomerate at base. Upper division consists of as much as 150 ft of red, ferruginous, somewhat calcareous sandstone that is mostly quartz and feldspar, and a small amount of mica. Green glauconitic mineral present in both divisions. Thickness variable. Is: missing at head of Taylor Creek; 130 ft thick at Deadmans gulch; 160 ft thick on lower Cement Creek. Geologic map. Mapped in southeast and northeast corners of Crested Butte quad. Columnar section. Overlies Archean granite gneiss and schist. Underlies Yule limestone (new). Of Late Cambrian age. Fossils of Potsdam age in upper division.

Summary of Citation: Sawatch

Publication:
Crawford, R.A., 1913, Geology and ore deposits of the Monarch
   and Tomichi districts, Colorado: Colorado Geological Survey
   Bulletin, no. 4, 317 p.

Usage in Publication:
Sawatch quartzite

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Piceance basin

Summary:
Overlies pre-Cambrian rocks in northwest corner of Tomichi district, T50N, R5E, Gunnison Co, CO in the Piceance basin. Revised in that Sawatch quartzite unconformably underlies the newly named Tomichi limestone. Is about 20 ft thick in northwest corner of district. Is a white hard quartzite composed mostly of sand grains one to two mm in diameter in a siliceous cement. Deposited in Cambrian time in shallow near-shore waters. Geologic map.

Summary of Citation: Sawatch

Publication:
Behre, C.H., Jr., 1932, Weston Pass mining district, Lake and
   Park Counties, Colorado: Colorado Scientific Society Proceedings,
   v. 13, no. 3, p. 55-75

Usage in Publication:
Sawatch quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Eagle basin South Park basin

Summary:
Consists of a lower member composed of dark-red quartzite, 90-135 ft thick and an upper member newly named Peerless shale member, 30-50 ft thick in Eagle and South Park basins. Is overlain by Manitou limestone, formerly called "White" limestone by miners in this area. Assigned to the Cambrian.

Summary of Citation: Sawatch

Publication:
Bassett, C.F., 1939, Paleozoic section in the vicinity of Dotsero,
   Colorado: Geological Society of America Bulletin, v. 50, no.
   12, pt. 1, p. 1851-1866

Usage in Publication:
Sawatch quartzite

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Eagle basin Piceance basin

Summary:
Revised in that Sawatch quartzite underlies the newly named Dotsero dolomite, a unit formerly called Manitou? dolomite in Glenwood Canyon near town of Dotsero, Eagle Co, CO in the Eagle basin. Overlies unnamed pre-Cambrian granite. Section 443+ ft thick measured a quarter of a mile east of mouth of Dead Horse Creek, Garfield Co, CO in the Piceance basin. Consists of gray, fine-grained sandstone that may be argillaceous and micaceous and red coarse sandstone of quartz grains, white buff, pink coarse- to fine-grained, cross-bedded quartzite, gray, arenaceous, micaceous shale, and one bed of buff to gray, finely crystalline, massive dolomite in measured section. Of Cambrian age. Inarticulate brachiopods in sandstones.

Summary of Citation: Sawatch

Publication:
Tweto, Ogden, 1949, Stratigraphy of the Pando area, Eagle County,
   Colorado: Colorado Scientific Society Proceedings, v. 15,
   no. 4, p. 149-235

Usage in Publication:
Sawatch quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Eagle basin

Summary:
Recognized in cliffs in the valley of the Eagle River and on dip slopes on flank of Sawatch Range, Eagle Co, CO in Eagle basin where it is a unit about 185 ft thick beneath the Peerless formation. Thins northeast and east from Pando. Rests on a smooth peneplain surface cut over pre-Cambrian rocks. Assigned to the Cambrian. Brachiopod DICELLOMUS identified.

Summary of Citation: Sawatch

Publication:
Maher, J.C., 1950, Pre-Pennsylvanian rocks along the Front Range
   of Colorado: U.S. Geological Survey Oil and Gas Investigations
   Chart, OC-39, 1 sheet

Usage in Publication:
Sawatch quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Denver basin

Summary:
Crops out on east side of Front Range in El Paso and Douglas Cos, CO of the Denver basin at Manitou Springs, Manitou Park, Perry Park, and at other isolated localities between Colorado Springs and Palmer Lake. Section 50+ ft thick measured in Williams Canyon, NW1/4 sec 32, T13S, R67W, El Paso Co. Ranges from 51 ft to 87 ft thick. Is a red, white, pink and brown, subround, fine-, medium- to coarse-grained sandstone. Is generally a quartz sand but some beds are feldspathic. Overlies Precambrian granite. Revised in that Sawatch quartzite underlies Ute Pass dolomite (a new name whose rocks were formerly included with basal Manitou limestone). Is correlated with Lamotte sandstone of the subsurface of eastern CO. Of Late Cambrian age. Cross sections.

Summary of Citation: Sawatch

Publication:
Bass, N.W. and Northrop, S.A., 1953, Dotsero and Manitou
   formations, White River Plateau, Colorado, with special
   reference to Clinetop algal limestone member of Dotsero
   formation: American Association of Petroleum Geologists
   Bulletin, v. 37, no. 5, p. 889-912

Usage in Publication:
Sawatch quartzite*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Piceance basin

Summary:
Revised in that Sawatch quartzite underlies the newly named Glenwood Canyon member of the Dotsero formation in Glenwood Canyon, Garfield Co, CO in the Piceance basin. Is of Late Cambrian age.

Summary of Citation: Sawatch

Publication:
Gerhard, L.C., 1972, Canadian depositional environments and
   paleotectonics, central Colorado, IN De Voto, R.H., ed.,
   Paleozoic stratigraphy and structural evolution of Colorado:
   Colorado School of Mines Quarterly, v. 67, no. 4, p. 1-36

Usage in Publication:
Sawatch Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Denver basin South Park basin Piceance basin

Summary:
Name Horseshoe Mountain Group applied to rocks of the Sauk sequence in central CO of Late Cambrian and Early Ordovician age. In its northwest province near Glenwood Springs, Garfield Co in the Piceance basin, the group is divided into the Sawatch Sandstone, Dotsero Formation (and its Glenwood Canyon and Clinetop Members), and Manitou Limestone (and its Deadhorse and Tie Gulch Members). In its southeast province--near Salida, Gunnison Co in the Piceance basin, Colorado Springs, El Paso CO in the Denver basin, and Fairplay, Park Co in the South Park basin--the group is divided into the Sawatch Sandstone, Peerless Formation, and Manitou Limestone (and its Helena Canyon, Ptarmigan (provisional), and Fairplay (provisional) Members). The group is named for exposures on Horseshoe Mountain (the type section) near Fairplay in Park Co. Rocks of the group include conglomerate, sandstone, shale, limestone, and dolomite. Correlation chart. Thickness of group at type (southeast facies--sec 12, T10S, R79W) is 352 ft: Manitou, 167 ft; Peerless, 35 ft; and Sawatch, 150 ft. Thickness of group in northwest facies (sec 15, T5S, R87W) is 772 ft: Manitou, 156 ft; Dotsero, 96 ft; and Sawatch, 520 ft.

Summary of Citation: Sawatch

Publication:
Gerhard, L.C., 1974, Redescription and new nomenclature of
   Manitou Formation, Colorado: American Association of Petroleum
   Geologists Bulletin, v. 58, no. 7, p. 1397-1406

Usage in Publication:
Sawatch Sandstone

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Denver basin Piceance basin South Park basin

Summary:
Sawatch revised in that it is assigned to the newly named Horseshoe Mountain Group as the basal formation at Salida, Gunnison Co, CO in the Piceance basin; Colorado Springs, El Paso Co, CO in the Denver basin; and Fairplay, Park Co, CO in the South Park basin. Correlation chart. Age not discussed. [Same information presented in Gerhard, 1972, Colorado School of Mines Quarterly, v. 67, no. 4, p. 1-36.]

Summary of Citation: Sawatch

Publication:
Bush, J.H. and Bush, C.G., 1974, Revisions in Cambrian nomenclature
   in central Colorado: The Mountain Geologist, v. 11, no. 2,
   p. 59-69

Usage in Publication:
Sawatch Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised Overview	Piceance basin Eagle basin South Park basin	Sandstone Conglomerate

Summary:
Revised in that a 0-100 ft thick quartz arenite and dolomite unit formerly assigned to Sawatch Quartzite removed from Sawatch and named Deadmans Gulch Formation. The new formation which occurs with the Sawatch in central CO in western Gunnison Co,, Piceance basin, Park Co, South Park basin, eastern Eagle, eastern Pitkin, southern Summit, Lake Co, and northern Chaffee Co, Eagle basin, was deposited concurrently with the Peerless Formation. Type section designated as the measured section in Deadmans Gulch, sec 14, T14S, R84W, Gunnison Co, CO in the Piceance basin. Described at type as a 127.4 ft thick, orange to white quartz arenite, and one 3 ft thick bed of conglomerate. The arenite beds may be dolomitic and calcareous, very slightly feldspathic to feldspathic, poorly, moderately to well sorted, fine-medium-, to very coarse grained, subangular, in thin layers to massive bedded, cross-bedded. One bed forms massive cliffs. Conglomerate has quartz pebbles in a matrix of coarse-grained, poorly sorted quartz. Cross sections. Late Cambrian age.