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northwestern Montana

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Series: GSA Field Guides
Published: 01 January 2017
DOI: 10.1130/2017.0048(04)
... ABSTRACT A large portion of the Belt-Purcell Supergroup is well exposed in the vicinity of Glacier and Waterton Lakes national parks of northwestern Montana, USA, and southwestern Alberta, Canada. These strata were deposited in the northeastern part of the Mesoproterozoic Belt Basin...
Published: 01 September 2016
DOI: 10.1130/2016.2522(01)
... The ca. 1.460 Ga Revett Formation is a gray and purple quartzite lithosome in northwestern Montana, and it interfingers eastward into red argillite of the Grinnell Formation in Glacier National Park. The Revett Formation was analyzed in northwestern Montana by identifying sedimentary structures...
Journal Article
Published: 01 March 2013
Bulletin of Canadian Petroleum Geology (2013) 61 (1): 1–40.
... is well-known in northern and central Alberta, but is poorly-known in southern Alberta. A correlation grid of >1200 well logs allowed allomember-bounding erosion surfaces E1 to E7 of the Cardium Formation to be traced across southern Alberta and into northern Montana. Twenty-five outcrop sections...
FIGURES | View All (27)
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
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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Journal Article
Journal: Geology
Published: 01 April 2009
Geology (2009) 37 (4): 379–382.
...F. Fuentes; P.G. DeCelles; G.E. Gehrels Abstract Stratigraphic, provenance, and subsidence analyses suggest that by the Middle to Late Jurassic a foreland basin system was active in northwestern Montana (United States). U-Pb ages of detrital zircons and detrital modes of sandstones indicate...
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Journal Article
Journal: Economic Geology
Published: 01 October 1997
Economic Geology (1997) 92 (6): 749–750.
Journal Article
Journal: Economic Geology
Published: 01 October 1997
Economic Geology (1997) 92 (6): 750–752.
Journal Article
Published: 01 September 1995
Canadian Journal of Earth Sciences (1995) 32 (9): 1303–1307.
...Paul E. Carrara Abstract During the Pinedale (Late Wisconsinan) glaciation, an outlet glacier from a mountain ice field flowed eastward across the Continental Divide through Marias Pass in northwestern Montana. This outlet glacier was the major source of the Two Medicine glacier, a large piedmont...
Journal Article
Journal: Economic Geology
Published: 01 December 1994
Economic Geology (1994) 89 (8): 1939–1963.
...Ian M. Lane; Richard E. Zehner; Gregory A. Hahn Abstract The Oligocene Hog Heaven high potassium dacite-rhyolite volcanic field covers 50 km 2 of northwestern Montana. Its composite flow domes and dikes, ash-flow deposits, volcaniclastic rocks, and sparse alkali basalt dikes intrude...
Journal Article
Published: 01 May 1993
Canadian Journal of Earth Sciences (1993) 30 (5): 1066–1075.
...Raymond R. Rogers; Carl C. Swisher III; John R. Horner Abstract The age of the nonmarine Two Medicine Formation of northwestern Montana is currently based upon correlations with K–Ar-dated Western Interior ammonite zones. 40 Ar/ 39 Ar dating of biotite and plagioclase separated from four bentonites...
Journal Article
Journal: AAPG Bulletin
Published: 01 June 1991
AAPG Bulletin (1991) 75 (6): 1089–1106.
...Theodore R. Yoos; Christopher J. Potter; Janet L. Thigpen; Larry D. Brown ABSTRACT COCORP and petroleum industry seismic reflection profiles in northwestern Montana reveal the structure of the Cordilleran foreland thrust belt. The Front Ranges consist of thick thrust sheets containing Precambrian...
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Journal Article
Journal: PALAIOS
Published: 01 October 1990
PALAIOS (1990) 5 (5): 394–413.
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1988
AAPG Bulletin (1988) 72 (12): 1437–1449.
... columns in such basins. The present study investigates the petroleum source rock potential of the freshwater lacustrine sediments, including mudstones, oil shales, and lignites, of the Kishenehn basin of northwestern Montana and southeast British Columbia. Outcrop samples of the Tertiary Kishenehn...
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Journal Article
Journal: Geology
Published: 01 July 1988
Geology (1988) 16 (7): 658–661.
Journal Article
Published: 01 June 1987
The Canadian Mineralogist (1987) 25 (2): 213–220.
Series: DNAG, Centennial Field Guides
Published: 01 January 1987
DOI: 10.1130/0-8137-5402-X.19
EISBN: 9780813754086
..., Belly, and Waterton drainages in Montana and Alberta (Fig. 1). With the exceptions of Stops 1 and 10, which occur on the Blackfeet Indin Reservation and in Waterton Park, respectively, all stops occur on public roads through private land. Landowner’s permission is not required for the excursion...
Journal Article
Journal: AAPG Bulletin
Published: 01 May 1985
AAPG Bulletin (1985) 69 (5): 850–851.
.... This zone (the Libby thrust belt) extends northward from the Lewis and Clark line to the northwest corner of Montana. Within the Libby thrust belt is a series of complex ramps, horsts, splays, and folds that accommodate a tectonic shortening of about 6.2 mi (10 km). Backsliding has occurred on some listric...
Journal Article
Journal: AAPG Bulletin
Published: 01 May 1985
AAPG Bulletin (1985) 69 (5): 858.
...K. M. Nichols ABSTRACT Pentagon Mountain exposes one of the best of the few sections of Mississippian rocks in the Lewis and Clark Range of northwestern Montana. This section consists of 225 m (738 ft) of marine carbonate rocks from which conodonts, ranging in age from earliest Osagean to early...
Journal Article
Journal: Geology
Published: 01 November 1983
Geology (1983) 11 (11): 643–646.