GEOLEX

Summary of Citation: Gallatin

Publication:
Peale, A.C., 1893, The Paleozoic section in the vicinity of
   Three Forks, Montana, with petrographic notes by G.P. Merrill:
   U.S. Geological Survey Bulletin, 110, 56 p.

Usage in Publication:
Gallatin formation*

Modifications:	Geologic Province:	Dominant Lithology:
First used	Montana folded belt province	Limestone Shale

Summary:
First used as a formation of Cambrian probably near the Silurian boundary age in Montana folded belt province. Mapped north of East Gallatin River, and east of the Missouri River, Gallatin Co., and west Missouri River, Broadwater Co., MT. Neither source of geographic name nor type locality stated. May have been named for East Gallatin River or for town of Gallatin that formerly existed at head of East Gallatin River. Divided into five units (descending order): 1) light-colored, pebbly, laminated limestone 145 ft thick; 2) Dry Creek shales, a new unranked term, a nonfossiliferous shale or shaly calcareous sandstone, brownish-yellow, red, and pink, about 30 ft thick; 3) mottled, massive, yellowish limestone, with dark spots 260 ft thick; some of the layers are glauconitic and oolitic; 4) dark-greenish, Obolella shales which are calcareous and 280 ft thick; and 5) trilobite limestones, 120 ft thick dark gray, fossiliferous, thin bedded, gray, thinly laminated, and very fossiliferous (brachiopods, trilobites). Lower contact placed at base of first well-developed trilobite limestone above Flathead formation (new). No apparent break in continuity of upper beds of Gallatin with limestones assigned to Jefferson formation (new), which have Devonian fossils. Assigned to the Cambrian.

Summary of Citation: Gallatin

Publication:
Miller, B.M., 1936, Cambrian stratigraphy of northwestern Wyoming:
   Journal of Geology, v. 44, no. 2, p. 113-144

Usage in Publication:
Gallatin formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Wind River basin Yellowstone province

Summary:
Attains a maximum thickness of about 300 ft in the northwestern part of Wind River Mountains and thins toward southeast part of that range. Divided into the Du Noir member (named), middle shaly division, and upper limestone division. Overlies Gros Ventre formation. Underlies "Big Horn" formation. The Du Noir--a massive, gray limestone with brown oolites--averages 40 ft thick. The middle shaly member is gray with beds of pebbly glauconitic limestone and nodular argillaceous limestone 30-35 ft thick. The upper limestone is a 195 ft thick unit. All three parts of the Gallatin are fossiliferous. Measured sections described: 1) divide between Teton and Death Canyons in Teton Co, Yellowstone province; 2) along Warm Creek; 3) in Crow Creek Canyon; 4) Wind River Canyon; and 5) Dry Creek, Fremont Co in the Wind River basin. Late Cambrian age.

Summary of Citation: Gallatin

Publication:
Deiss, C.F., 1938, Cambrian formations and sections in part of
   Cordilleran Trough: Geological Society of America Bulletin,
   v. 49, no. 7, p. 1067-1168

Usage in Publication:
Gallatin formation

Modifications:	Geologic Province:	Dominant Lithology:
Not used

Summary:
Not used in Wind River Canyon area in eastern part of Owl Creek Range, WY, Bighorn and Wind River basins. Replaced by Boysen formation (new). Use of term Gallatin dropped by U.S. Geological Survey in 1900. Subsequent use has caused confusion in nomenclature in WY and MT; thus Boysen used to indicate Upper Cambrian rocks in study area.

Summary of Citation: Gallatin

Publication:
Dorf, E. and Lochman, Christina, 1940, Upper Cambrian formations
   in southern Montana: Geological Society of America Bulletin,
   v. 51, no. 4, p. 541-556

Usage in Publication:
Gallatin limestone

Modifications:	Geologic Province:	Dominant Lithology:
Not used

Summary:
Not used in southern MT and northwest WY in area including Snowy, Beartooth and Absaroka Mountains, Gallatin Range and northwest Yellowstone Park. Term too loosely used resulting in confusion in correlations. Replaced by three newly named Upper Cambrian units which are, in ascending order, Maurice, Snowy Range, and Grove Creek formations.

Summary of Citation: Gallatin

Publication:
Shaw, A.B. and McGrew, P.O., 1954, Correlation of the pre-Quaternary
   formations of Wyoming; Chart II: Wyoming Geological Association
   Field Conference Guidebook, no. 9

Usage in Publication:
Gallatin group

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Yellowstone province Greater Green River basin Bighorn basin Wind River basin

Summary:
Gallatin formation raised to group rank and its members raised to formation rank in footnote on Chart II. Includes (ascending): Dunoir [sic] limestone (Dresbachian), Dry Creek shale (early Franconian), and Sage limestone (middle to late Franconian). Gallatin overlies Park shale (rank raised) of Gros Ventre group (rank raised). Gallatin unconformably underlies Darwin sandstone. This nomenclature is used from Jackson Hole in Yellowstone province, southwest WY, Greater Green River basin, in the Bighorn and Wind River basins. Only the Sage limestone is present in eastern Bighorn basin.

Summary of Citation: Gallatin

Publication:
Shaw, A.B. and Deland, C.R., 1955, Cambrian of southwestern
   Wyoming, IN Camp, R.J., chairman, Green River basin: Wyoming
   Geological Association Field Conference Guidebook, no. 10,
   p. 38-42

Usage in Publication:
Gallatin group

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Yellowstone province Wind River basin Greater Green River basin

Summary:
Divided into (ascending): Du Noir limestone and Open Door limestone (named) of Gallatin group. Basal reentrant-forming part of Open Door assigned as the Dry Creek shale member. These rocks have been assigned to the Gallatin limestone, Grove Creek and Snowy Range formations, Sage Pebble conglomerates, etc in earlier reports. This author follows his own nomenclature used in an unpublished correlation chart that of Gallatin group. Cross sections. Faunal lists. Du Noir has three Dresbachian faunal zones. The Dresbachian-Franconian boundary lies in the Dry Creek. The Open Door lies in the ELVINIA zone. Gallatin recognized on sections in Teton Co, WY in Yellowstone province; Fremont Co, WY in Wind River basin; and Lincoln, Sublette, and Carbon Cos, WY in Greater Green River basin.

Summary of Citation: Gallatin

Publication:
Hose, R.K., 1955, Geology of the Crazy Woman Creek area, Johnson
   County, Wyoming, IN Contributions to economic geology, 1955:
   U.S. Geological Survey Bulletin, 1027-B, p. B33-B118

Usage in Publication:
Gallatin limestone*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified Overview	Powder River basin

Summary:
Mapped undivided with Gros Ventre formation in Johnson Co, WY, Powder River basin. Thickness is about 50 ft, though is too thin to be mapped separately. Underlies Bighorn dolomite. Measured section; generalized stratigraphic section. Though no fossils were found in Gallatin within mapped area, Denson (personal communication, 1951) reported a Canadian (Lower Ordovician) fauna in unit about 32 mi to northwest. Assigns age of undivided Gros Ventre and Gallatin as Late Cambrian and equivocally Early Ordovician age.

Summary of Citation: Gallatin

Publication:
Pierce, W.G., 1965, Geologic map of the Deep Lake quadrangle,
   Park County, Wyoming: U.S. Geological Survey Geologic Quadrangle
   Map, GQ-478, 1 sheet, scale 1:62,500

Usage in Publication:
Gallatin Group*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Bighorn basin

Summary:
Rank raised to group; includes in ascending order, Pilgrim Limestone and Snowy Range and Grove Creek Formations. Map covers part of Beartooth Mountains in northwest WY within Bighorn basin. Late Cambrian age.

Summary of Citation: Gallatin

Publication:
Keefer, W.R. and Van Lieu, J.A., 1966, Paleozoic formations in
   the Wind River basin, Wyoming, IN Geology of the Wind River
   basin, central Wyoming: U.S. Geological Survey Professional
   Paper, 495-B, p. B1-B60

Usage in Publication:
Gallatin Limestone*

Modifications:	Geologic Province:	Dominant Lithology:
Revised Overview Areal limits	Wind River basin

Summary:
Gallatin Limestone divided into Du Noir Limestone Member (base) and Open Door Limestone Member (top). Usage in this paper represents a change in stratigraphic rank used by Shaw (1955) for Gallatin (from group), and Du Noir and Open Door (from formation). Gallatin forms cliffs above shale slopes of Gros Ventre Formation and is separated from the overlying Bighorn Dolomite by an erosional unconformity. The formation is 265 to 365 ft thick in the Wind River Range, 235 to 455 ft thick in the Washakie Range, Owl Creek, and southern Bighorn Mountains, 209 ft thick along south edge of Wind River basin. The Du Noir described as a cliff-forming, thin-bedded, glauconitic and oolitic limestone with some flat-pebble conglomerate. The Open Door has a lower soft, green-gray shale with minor thin-bedded, gray limestone, and an upper gray, thin-bedded to massive limestone and a few flat-pebble conglomerates. The members can be traced in the Washakie Range, along the south side of the Owl Creek Mountains, and into the southern Bighorn Mountains of WY in the Wind River basin. The boundary between the APHELASPIS and ELVINIA zones nearly corresponds to the Du Noir-Open Door contact. Is a marine deposit of Late Cambrian age. Cross sections.

Summary of Citation: Gallatin

Publication:
Pierce, W.G. and Nelson, W.H., 1971, Geologic map of the Beartooth
   Butte quadrangle, Park County, Wyoming: U.S. Geological Survey
   Geologic Quadrangle Map, GQ-935, 1 sheet, scale 1:62,500

Usage in Publication:
Gallatin Group*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Bighorn basin

Summary:
Revised in that Grove Creek reduced to member rank and assigned to Snowy Range Formation of Gallatin. Gallatin in map area consists of Snowy Range and underlying Pilgrim Limestone. Map is in area of Beartooth Mountains in northwest WY, Bighorn basin. Late Cambrian age.

Summary of Citation: Gallatin

Publication:
Pierce, W.G., Nelson, W.H. and Prostka, H.J., 1973, Geologic
   map of the Pilot Peak quadrangle, Park County, Wyoming: U.S.
   Geological Survey Miscellaneous Investigations Series Map,
   I-816, 1 sheet, scale 1:62,500

Usage in Publication:
Gallatin Group*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Bighorn basin Yellowstone province Montana folded belt province

Summary:
Extended into area around northeast boundary of Yellowstone National Park, Park Co, WY and Park Co, MT, Yellowstone province, Bighorn basin and Montana folded belt province. Gallatin in map area consists of Snowy Range Formation and underlying Pilgrim Limestone. Late Cambrian age.