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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.
.... 1997 , Distribution of dinosaur eggshell fragments in an overbank deposit, Two Medicine Formation, Choteau, Montana: a preliminary report : Abstracts with Programs, Geological Society of America , v. 29 , p. 272 . Kim S.B...
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Journal Article
Journal: PALAIOS
Published: 01 May 2015
PALAIOS (2015) 30 (5): 362–372.
... and intact egg, MOR 301A. These eggs from the Egg Mountain locality were previously figured in Hirsch and Quinn (1990 , fig. 9A–H). Lorenz and Gavin (1984) described four lithofacies (A–D) of the Two Medicine Formation exposed near Choteau, Montana. Exposures at the Willow Creek anticline are made up...
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Journal Article
Published: 01 September 2020
Journal of Paleontology (2020) 94 (5): 922–930.
... ). The abundance of insect trace fossils ascribed to fossorial hymenopterans in paleosols corroborates this interpretation (Martin and Varricchio, 2011 ; Freimuth and Varricchio, 2019 ). Egg Mountain is located 19 km west of Choteau, Montana and is part of the Willow Creek anticline ( Fig. 1 ). The site...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1975
AAPG Bulletin (1975) 59 (8): 1353–1363.
... 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. Fifty-eight percent of the state’s completions (382...
FIGURES
Journal Article
Journal: Paleobiology
Published: 01 October 2015
Paleobiology (2015) 41 (4): 503–527.
... Two Medicine Formation of Montana initially attracted scientific attention by providing the first evidence that at least some dinosaur taxa nested in colonies and that the altricial hatchlings were cared for by adults (Horner and Makela 1979 ; Barreto 1997 ; Horner et al. 2001...
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Journal Article
Journal: Paleobiology
Published: 01 January 2021
Paleobiology (2021) 47 (1): 101–114.
... the eggs. D, An image of the surrogate outside in the testing area near Bozeman, Montana, at an elevation around 1850 m. The indoor experimental system was of a size and situation such that energy could continually flow from the surrogate into the environment without raising ambient temperature...
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Series: SEPM Special Publication, SEPM Special Publication
Published: 01 January 2007
DOI: 10.2110/pec.07.86.0175
EISBN: 9781565762947
... The purpose of this study is to determine the age, extent, and tectonic significance of a set of mafic sills within the Belt-Purcell basin of northwestern Montana. The Mesoproterozoic Belt-Purcell basin dominates the Northern Rocky Mountains of Montana (Fig. 1). It has been the focus of many...
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Image
FIGURE 1 —Regional tectonic map of western <b>Montana</b> showing field area and t...
in > PALAIOS
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
Published: 01 September 2020
Journal of Paleontology (2020) 94 (5): 887–905.
... fossils were discovered in the lower part of Two Medicine Formation near Choteau, Montana. The abundant specimens from the study area represent one of the larger documented assemblages of horseshoe crab traces and preserve varied morphology and configurations and include not only ‘foot’ (chelae), but also...
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Series: Geological Society, London, Special Publications
Published: 02 January 2020
DOI: 10.1144/SP487.12
EISBN: 9781786204721
... Abstract The Teton anticline and adjacent structures, in the Sawtooth Range, Montana, USA, are fractured in such a way that may be taken as a model for fractures propagating during buckle folding. However, advances in understanding both the process of folding in forelands and the evolution...
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Journal Article
Journal: PALAIOS
Published: 01 September 2007
PALAIOS (2007) 22 (5): 554–566.
... south of Choteau. A crystal tuff and an ash layer at this site (∼105 m above the base of the formation) have been dated at ca. 80 Ma ( Rogers et al., 1993 ). Coprolites from the upper part of the formation were found southwest of Cut Bank, Montana, near Jack's Birthday Site bone bed, a quarry ∼100 m...
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Journal Article
Journal: PALAIOS
Published: 01 January 2010
PALAIOS (2010) 25 (3): 183–195.
... the TMF near Choteau, Montana, and found general agreement, with bones derived from fine-grained overbank deposits enriched in light REE and bones derived from sandstones enriched in heavy REE. Readers should consult Metzger et al. (2004) , Martin et al. (2005) , and Suarez et al. (2007...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1956
AAPG Bulletin (1956) 40 (5): 1001–1004.
... Plains. The layer of white bentonite lies near the base of this calcareous shale unit. 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...
Journal Article
Published: 01 August 1977
Bulletin of Canadian Petroleum Geology (1977) 25 (4): 828–841.
.... Field Conf., Sawtooth Range - Disturbed belt, 1959: p. 84-88. Willis, Bailey, 1902, Stratigraphy and structure, Lewis and Livingston ranges, Montana: Geol. Soc. America Bull., v. 13, p. 305-352. Wimmler, N. L., 1946, Exploration of Choteau titaniferous magnetite deposit, Teton County, Montana: U.S. Bur...
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: 01 August 1977
Bulletin of Canadian Petroleum Geology (1977) 25 (4): 736–751.
... ft (375 m) thick between the underlying Spokane Formation and the overlying Helena Formation. The Altyn, Helena, and Shepard Formations compose the Belt carbonate units. Parts of Glacier National Park and the adjacent areas are in the northern disturbed belt of Montana. The area east of the mountains...
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. Fig. 1.— OIL FIELDS AND STRUCTURE OF THE SWEETGRASS ARCH NORTH CENTRAL MONTANA...
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