Choteau Montana

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Journal Article
Journal: PALAIOS
Published: 01 October 2000
PALAIOS (2000) 15 (5): 476–482.
...ERIC M. ROBERTS; MARC S. HENDRIX Abstract The taphonomy of a newly discovered petrified forest in the Two Medicine Formation, south of Choteau, Montana, provides new constraints on the pre-thrusting position of the Boulder batholith and Elkhorn Mountains Volcanics. The petrified forest consists...
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Series: DNAG, Centennial Field Guides
Published: 01 January 1987
DOI: 10.1130/0-8137-5402-X.41
EISBN: 9780813754086
... Abstract The Shonkin Sag laccolith is on the northeast flank of the Highwood Mountains in Sec. 22–27, T.2 1N., R.11 E., in Choteau County, Montana. The laccolith lies entirely within the Geraldine, Montana, 1:24,000 Quadrangle. It is approximately 44 mi (71 km) east of Great Falls and 54 mi (87...
Journal Article
Journal: PALAIOS
Published: 01 June 2015
PALAIOS (2015) 30 (6): 435–445.
... of the reorientation of pebbles and shells : The Journal of Geology , v. 75 , p. 243 – 267 . Kennedy E. 1997 , Distribution of dinosaur eggshell fragments in an overbank deposit, Two Medicine Formation, Choteau, Montana...
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Journal Article
Journal: PALAIOS
Published: 01 May 2015
PALAIOS (2015) 30 (5): 362–372.
... Choteau, Montana. Exposures at the Willow Creek anticline are made up of strata in their Lithofacies D and consist of four subfacies: (1) a lower subfacies of red to orange siltstone and mudstone with irregular calcareous nodules and interbedded gray lenticular sandstone deposited in an anastomosed...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1975
AAPG Bulletin (1975) 59 (8): 1353–1363.
... activity was in search of shallow Upper Cretaceous gas sandstones in north-central Montana in Blaine (94 completions), Hill (86 completions), Phillips (66 completions), Choteau (50 completions), Liberty (37 completions), Fergus (14 completions), Toole (42 completions), and Pondera (7 completions) Counties...
Journal Article
Journal: Paleobiology
Published: 01 October 2015
Paleobiology (2015) 41 (4): 503–527.
...-003, TM-151, TM-158) within the Two Medicine Formation in an area of badland exposures approximately 19 km west of Choteau, Montana. The TM-003 locality is approximately 153 m northwest of TM-158, and approximately 629 m southeast of TM-151. Although erosion along the Willow...
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Series: SEPM Special Publication
Published: 01 January 2007
DOI: 10.2110/pec.07.86.0175
EISBN: 9781565762947
... Abstract Mafic intrusions within the Mesoproterozoic Belt-Purcell basin of the Northern Rocky Mountains of Montana record important Mesoproterozoic and Neoproterozoic rifting episodes. Previous studies established four major Mesoproterozoic igneous intrusive events. This project focuses...
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FIGURE 1 —Regional tectonic map of western <b>Montana</b> showing field area and t...
Published: 01 October 2000
FIGURE 1 —Regional tectonic map of western Montana showing field area and tree localities (modified from: Rogers et al., 1993 ; Lorenz and Gavin, 1984 ). AMV = Adel Mountains Volcanics, EMV = Elkhorn Mountains Volcanics, HB = Haystack Butte, TMF = Two Medicine Formation, AG = Augusta, BT = Butte
Journal Article
Journal: PALAIOS
Published: 01 September 2007
PALAIOS (2007) 22 (5): 554–566.
... three stratigraphic horizons that are spread throughout much of the thickness of the Two Medicine Formation ( Fig. 2 ). Most of the specimens analyzed in this study are from the Willow Creek Anticline locality (WCA), a 5 km 2 fossiliferous exposure southwest of Choteau, Montana ( Fig. 1 ). This portion...
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Series: Geological Society, London, Special Publications
Published: 02 January 2020
DOI: 10.1144/SP487.12
EISBN: 9781786204721
...), a Janet Watson Scholarship from Imperial College, London, a Geological Society of London grant for fieldwork and an AAPG Susanne Takken Memorial Grant. The Teton Canyon area is located 30 miles NW of Choteau, Montana ( Fig. 2 ). At this point, the Teton River, which flows from west to east, has two...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1956
AAPG Bulletin (1956) 40 (5): 1001–1004.
.... In undisturbed sections the bed of bentonite is ordinarily about 3 feet thick. It is present over the north-central part of Montana from Glacier National Park southeastward to the Missouri River near Wolf Creek and eastward across the Sweetgrass arch at least as far as the Musselshell River (Cobban, 1951a, pp...
Journal Article
Journal: PALAIOS
Published: 01 January 2010
PALAIOS (2010) 25 (3): 183–195.
..., whereas bones that undergo recrystallization in rivers and streams will be relatively enriched in heavy REE. Trueman (1999) tested this model in fossils recovered from the TMF near Choteau, Montana, and found general agreement, with bones derived from fine-grained overbank deposits enriched in light REE...
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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1945
AAPG Bulletin (1945) 29 (9): 1262–1303.
...W. A. Cobban ABSTRACT The marine Jurassic rocks of the Sweetgrass arch in western north-central Montana have been assigned to the Ellis formation. As a result of measuring and sampling eleven Jurassic sections around the Sweetgrass arch and from examining numerous well cuttings, the writer...
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Journal Article
Published: 03 June 2016
Geological Magazine (2016) 153 (5-6): 845–865.
...C. M. BURBERRY; J. M. PALU Abstract The reactivation potential of pre-existing deep-seated structures influences deformation structures produced in subsequent compression. This contribution investigates thrust geometries produced in surface thrust sheets of the Sawtooth Range, Montana, USA...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1929
AAPG Bulletin (1929) 13 (7): 779–797.
... areas on the Sweetgrass arch remain untested, especially those in which surface structure is obscured by glacial drift. Such areas are worthy of intelligent prospecting in an attempt to locate local structures. The Sweetgrass arch comprises a large area in north-central Montana, which extends...
Journal Article
Journal: Geosphere
Published: 01 October 2012
Geosphere (2012) 8 (5): 1104–1128.
...Facundo Fuentes; Peter G. DeCelles; Kurt N. Constenius Abstract The Cordilleran thrust belt of northwestern Montana (United States) has received much less attention than its counterparts in the western interior of USA and Canada. The structure of the thrust belt in this region is well preserved...
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Journal Article
Published: 06 January 2015
Canadian Journal of Earth Sciences (2015) 52 (2): 96–111.
... Virgelle Member of the Upper Cretaceous Milk River Formation (called Eagle Formation in Montana). To assess the conditions needed for a sustainable use of the aquifer, a comprehensive and unified portrait of the aquifer is needed across its international boundary. The stratigraphic framework and geometry...
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Journal Article
Journal: AAPG Bulletin
Published: 01 March 1980
AAPG Bulletin (1980) 64 (3): 316–338.
...Dudley D. Rice Abstract Depositional environments of the Upper Cretaceous Eagle Sandstone were studied at outcrops along the Missouri River and its southern tributaries from the town of Virgelle southeastward to the mouth of the Judith River in north-central Montana. In this area, the Eagle...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2011
GSA Bulletin (2011) 123 (3-4): 507–533.
... from Middle Jurassic through Eocene time in northwestern Montana. The oldest deposits in the foreland basin system consist of relatively thin, regionally tabular deposits of the marine Ellis Group and fluvial-estuarine Morrison Formation, which accumulated during Bajocian to Kimmeridgian time. U-Pb...
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Series: Society for Sedimentary Geology
Publisher: Society for Sedimentary Geology
Published: 01 January 2017
DOI: 10.2110/sepmsp.107.12
EISBN: 9781565763456
... Mountain front near Choteau, correlative to the thick subsurface Potlatch evaporites of northwest Montana ( Fig. 5B ). Similar thick interbedded stromatolitic carbonate and breccia of the upper Jefferson Formation in the Lemhi and Lost River Range are interbedded with dark marine subtidal carbonates...
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