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Broadwater Formation

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Present-day and reconstructed slopes for the Ogallala and <b>Broadwater</b> <b>Format</b>...
Published: 01 October 2014
Figure 13. Present-day and reconstructed slopes for the Ogallala and Broadwater Formation from 10 Ma to present and a comparison to model slope due to a reduction in mantle-driven uplift rate. (A) Present-day and reconstructed slopes of the Ogallala and Broadwater Formations and the modern North
Journal Article
Journal: Geology
Published: 01 October 2012
Geology (2012) 40 (10): 871–874.
... collected from Late Miocene Ogallala Group and Pliocene Broadwater Formation of the Nebraskan Great Plains demonstrates a twofold increase in the median grain size (from 20 mm to >40 mm) exported from the Rocky Mountains across the Miocene-Pliocene boundary. Paleoslope reconstructions derived from...
FIGURES | View All (4)
Image
Location map, showing granulometric analysis sites in the Ogallala and Rems...
Published: 01 October 2012
Group; AHF—Ash Hollow Formation; BF—Broadwater Formation; RRB—Remsburg Ranch beds. Timing of events is shown on the left. C: North-south strike section showing arrangement of Miocene and Pliocene sedimentary successions (cf. Swinehart et al., 1985 ).
Series: Contributions to Geology, Contributions to Geology
Published: 01 January 1974
DOI: 10.2113/gsrocky.13.special_paper_2.1
EISBN: 9780989762618
... than the Sand Draw, Broadwater, and Blanco faunas. It is younger than the Curtis Ranch fauna. Faunal and paleomagnetic correlation indicate it is about 2.5 m.y. old. Tapirus, Geochelone , and Sigmodon indicate the climate was mild and precipitation was much more effective than at present. Savanna...
Series: Contributions to Geology, Contributions to Geology
Published: 01 January 1974
DOI: 10.2113/gsrocky.13.special_paper_2.1
EISBN: 9780989762618
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1949
AAPG Bulletin (1949) 33 (7): 1276–1280.
... are definitely correlatable with Astian (upper Pliocene) continental formations of Europe and that overlying Broadwater or Blancan deposits correspond to the Villafranchian of Europe. The line between Pliocene and Pleistocene is judged to belong between uppermost Ogallala and Broadwater or Blancan deposits...
FIGURES
Journal Article
Journal: Geology
Published: 16 November 2018
Geology (2019) 47 (1): 3–6.
... ( Fig. 1 ; Diffendal, 1982 ). Subsequent incision and aggradation deposited the Broadwater Formation between 3.7 and 2.5 Ma ( Swinehart et al., 1985 ). Modern erosion has resulted in the formation of the “Rocky Flats” terrace surface, which was incised from 2 to 1 Ma ( Riihimaki et al., 2006...
FIGURES
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 October 2014
Lithosphere (2014) 6 (5): 303–318.
...Figure 13. Present-day and reconstructed slopes for the Ogallala and Broadwater Formation from 10 Ma to present and a comparison to model slope due to a reduction in mantle-driven uplift rate. (A) Present-day and reconstructed slopes of the Ogallala and Broadwater Formations and the modern North...
FIGURES | View All (13)
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1981
AAPG Bulletin (1981) 65 (2): 291–302.
... , Bouguer gravity, aeromagnetic, and generalized geologic map of the eastern part of the Three Forks basin, Broadwater, Madison, and Gallatin Counties, Montana : U.S. Geol. Survey Geophys. Inv. Map GP-498 , scale 1:62,500. Dobbin , C. E. , and C. E. Erdmann , 1955 , Structure contour map...
FIGURES | View All (12)
Journal Article
Journal: Paleobiology
Published: 01 January 2002
Paleobiology (2002) 28 (2): 244–250.
..., including simple furrowing and the formation of special microtubule structures such as phycoplasts and phragmoplasts ( Pickett-Heaps 1975 ; Scott and Broadwater 1990 ). The initiation of cell wall deposition occurs at cytokinesis, with cell wall growing centrifugally to merge the parental cell wall (e.g...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 June 1981
AAPG Bulletin (1981) 65 (6): 1146–1159.
...Donald L. Gautier ABSTRACT In the northern Great Plains, large quantities of biogenic methane are contained at shallow depths in Cretaceous marine mudstones. The Gammon Shale and equivalents of the Milk River Formation in Canada, which comprise most sediments deposited offshore during the Eagle...
Journal Article
Published: 01 January 2002
Rocky Mountain Geology (2002) 37 (1): 13–30.
... and Wheeler, 1964 ; Monroe, 1981 ). Tertiary strata on the western side of Townsend Valley generally have been considered to be equivalent to the Renova Formation of Kuenzi and Fields (1971) and subsequent authors, based on lithostratigraphy and mammalian biochronology. Pardee (1925) described ash...
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Journal Article
Published: 01 March 2013
Journal of Paleontology (2013) 87 (2): 289–296.
... stratigraphically than the main pocket at Pipestone Springs ( Kuenzi and Fields, 1971 ). USNM specimens are from Dry Hollow, Dunbar Creek Formation, Broadwater County, Montana. Previous specimens from this area indicate an Orellan age (early Oligocene; Korth, 1992 , 2007 ). However, the University of Montana has...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1983
AAPG Bulletin (1983) 67 (8): 1344.
... [30 to 90 m] thick) probably is a regressive shoreline and nearshore deposit. It is overlain and underlain by thick marine Cretaceous shale from which oil and gas were tested in nearby drill holes, and which could be a hydrocarbon source for the Eagle and other reservoirs. The Kootenai Formation...
Journal Article
Published: 01 January 2010
Journal of Paleontology (2010) 84 (1): 51–65.
... ), such as UNSM 4707-39 ( Table 3 ) and UNSM 21382 from Broadwater l.f. The degree of development of stylids and hypsodonty between the specimens is also similar. Size differences between the teeth from San Miguel and the holotype TMM 31181-126, from the Blanco l.f. of Texas, can be attributed to differences...
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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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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1973
AAPG Bulletin (1973) 57 (9): 1703–1713.
...G. T. Moore Abstract Megascopic and microscopic study of mid-Paleozoic carbonate formations in southwestern Montana shows that the Lodgepole Limestone (late Kinderhook to middle Osage), the lower formation of the Madison Group, is particularly suited to evaluation of paleogeographic history...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0036(01)
EISBN: 9780813756363
... Formation, recognized in north-central Nebraska by Skinner and Hibbard (1972) , is now considered to be the northeastern extension of the Broadwater Formation, which was named in western Nebraska ( Swinehart et al., 1985 ; Swinehart and Diffendal, 1990; Diffendal and Voorhies, 1994 ; Diffendal et al...
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Journal Article
Journal: PALAIOS
Published: 01 October 2009
PALAIOS (2009) 24 (10): 672–684.
...Roger M.H. Smith; Claudia A. Marsicano; Jeffrey A. Wilson Abstract An Early Jurassic tetrapod tracksite in the upper Elliot Formation at Moyeni, southern Lesotho, displays a variety of trackways attributed to large- and medium-sized theropod ( Neotrisauropus -type) and ornithischian...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 1965
AAPG Bulletin (1965) 49 (11): 1801–1823.
... depositional patterns and present structural configuration are closely related to distribution of that thick sedimentary wedge. Coarse arkosic conglomerate was deposited along the southern fault-controlled margin of the Belt embayment. Cambrian through Mississippian formations and parts of the Cretaceous...
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