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Broadwater Formation

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Present-day and reconstructed slopes for the Ogallala and <span class="search-highlight">Broadwater</span> <span class="search-highlight">Format</span>...
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...
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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
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
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.
.... Above this, the Ash Hollow Formation (10–6 Ma) comprises east-west–oriented gravel-rich channel bodies encompassed in floodplain siltstones ( Fig. 1 ; Diffendal, 1982 ). Subsequent incision and aggradation deposited the Broadwater Formation between 3.7 and 2.5 Ma ( Swinehart et al., 1985 ). Modern...
FIGURES
Journal Article
Journal: Geosphere
Published: 16 March 2023
Geosphere (2023) 19 (3): 695–718.
... of the Ogallala alluvial plain ( Fig. 1 ). In the Pliocene, increased stream power associated with a warm, wet climatic optimum dispersed gravels of the Broadwater Formation east-northeastward across Nebraska ( Duller et al., 2012 ). From the beginning of the Pleistocene, major streams such as the North and South...
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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.
.... D. Robinson , 1965 , 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...
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Journal Article
Journal: Paleobiology
Published: 01 January 2002
Paleobiology (2002) 28 (2): 244–250.
... in living algae can be accomplished in a number of ways, 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...
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
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 2002
Rocky Mountain Geology (2002) 37 (1): 13–30.
... 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 as the dominant component of Tertiary rocks in Townsend Valley...
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Journal Article
Published: 01 January 2003
The Journal of Geology (2003) 111 (1): 115–124.
... Nebraska, in the 1-Ma Cap Rock Member of the Ash Hollow Formation of the Ogallala Group, which contains a spectacular large-mammal fossil occurrence (Voorhies and Thomasson 1979 ). It represents a remarkable death assemblage of multiple whole skeletons of numerous species including rhinoceros, camels...
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Journal Article
Published: 01 March 2013
Journal of Paleontology (2013) 87 (2): 289–296.
... 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 reported Chadronian collections from this same area including specimens of the otherwise Chadronian...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0036(01)
EISBN: 9780813756363
... System Ogallala Group (Miocene) Figure 4. Hubbard Rhino Barn and adjacent exposure in ravine at Ashfall Fossil Beds. (A) Minor exposures of Broadwater, Ash Hollow, and Valentine Formations in ravine. Skeletons are preserved in place in barn. (B) Stratigraphy in adjacent ravine and positions...
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Journal Article
Published: 01 March 2002
The Journal of Geology (2002) 110 (2): 123–140.
... Airstrip) yielded C 4 signals. Fossils from Blancan and Irvingtonian localities record variable amounts of C 4 vegetation in diet. The Hall Gravel Pit, Broadwater, Quinn Gravel Pit, Big Springs, and Angus Quarry localities all record substantial C 4 vegetation in equid diets, while the South Wind...
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Journal Article
Published: 01 November 2022
Journal of Paleontology (2022) 96 (6): 1379–1389.
...), from Mt. Blanco, Blanco Formation, Crosby County, Texas, U.S.A, by original designation. Gray Fossil Site, Washington County, Tennessee, Early Pliocene (late Hemphillian or early Blancan age). * Corresponding author. Appendicular bones are important to understanding...
FIGURES
Journal Article
Published: 01 January 2010
Journal of Paleontology (2010) 84 (1): 51–65.
... ) 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 in wear stage; IGM 2346...
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