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Chaffee Group

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Journal Article
Journal: AAPG Bulletin
Published: 01 February 1970
AAPG Bulletin (1970) 54 (2): 313–325.
...John A. Campbell Abstract During the Late Devonian, sediments deposited in shallow marine, brackish, and tidal mud-flat environments accumulated in west-central Colorado. This sedimentary sequence comprises the Chaffee Group, which is divided into two formations; the lower third, the Parting...
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—Isopach map of <span class="search-highlight">Chaffee</span> <span class="search-highlight">Group</span>. CI = 25 ft.
Published: 01 February 1970
Fig. 2. —Isopach map of Chaffee Group. CI = 25 ft.
Journal Article
Published: 01 June 2022
Rocky Mountain Geology (2022) 57 (1): 1–21.
...–Carboniferous (Mississippian) Chaffee Group. We also report new detrital zircon ages from the late Cambrian Sawatch Quartzite, and a U–Pb zircon crystallization age on a late Mesoproterozoic (1087.9 ± 13.5 Ma) granitoid of underlying basement from the Eagle Basin of northwest Colorado. Grain populations...
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—Structural cross section across Laramide Grand Hogback monocline at East R...
Published: 01 February 1990
(?) Chaffee Group, and Mississippian Leadville Limestone, 8 = Precambrian crystalline rock.
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A,  Geological map of Hanging Lake (general area shown in  Fig. 1B ) and Gl...
Published: 01 June 2022
; Єd = Cambrian Dotsero Formation; Om = Ordovician Manitou Formation; Dc = Devonian Chaffee Group; Ml = Mississippian Leadville Limestone; ℙb = Pennsylvanian Belden Formation; ℙev = Pennsylvanian Eagle Valley Evaporite; P-ℙm = Permian–Pennsylvanian Maroon-Minturn Formations.
Image
Photomicrographs of representative siliciclastic-grain-bearing lithofacies ...
Published: 01 June 2022
Figure 3. Photomicrographs of representative siliciclastic-grain-bearing lithofacies of the Chaffee Group, arranged in descending stratigraphic order. A, Gilman sandstone with bimodal sorting of very well-rounded medium- to coarse-grained quartz in a coarse silt to very fine sand matrix
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Stratigraphic and geographic framework for samples of this study.  A,  Stat...
Published: 01 June 2022
. Abbreviations: Carbon. = Carboniferous; Hard. = Harding; Saw. = Sawatch. D , Detailed locality, stratigraphy, and biostratigraphy for the Chaffee Group strata in the White River uplift area. Dashed lines indicate time horizons; solid lines indicate unit boundaries. Specific detrital zircon sample names
Journal Article
Published: 01 June 2022
Rocky Mountain Geology (2022) 57 (1): 23–33.
... 2022 © 2022 University of Wyoming 2022 University of Wyoming ALFIE Chaffee Group Dasberg Event Dyer Formation extinction Famennian Gilman Sandstone the Flat Tops Tournaisian The Devonian–Carboniferous transition is punctuated by global biotic change, including the Famennian...
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Journal Article
Published: 01 February 1948
American Mineralogist (1948) 33 (1-2): 64–75.
...E. Wm. Heinrich Abstract A small group of pegmatites in Chaffee and Fremont Counties, Colorado, is characterized by the association of fluorite with the rare earth minerals, euxenite, monazite, allanite, and gadolinite. The deposits, which are differentiated into central and outer zones...
Journal Article
Published: 01 October 2021
Rocky Mountain Geology (2021) 56 (2): 51–67.
...: This article is published under the terms of the CC-BY 3.0 license . Chaffee Group conodonts Devonian–Carboniferous transition Dyer Formation Famennian Hangenberg Crisis Patrognathus Pelekysgnathus Pseudopolygnathus. Conodonts are generally well preserved in the Dyer ( Figures 4...
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Journal Article
Published: 13 September 2013
Geochemistry: Exploration, Environment, Analysis (2014) 14 (1): 71–84.
...Maurice A. Chaffee; Harley D. King Abstract Eureka, Nevada, was once a boom-mining town with peak production of Pb, Ag, and Au between the 1870s and 1890s. Most of the ores from the area were processed in two smelters located at the north and south edges of the town. Smelter effluent was exhausted...
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Journal Article
Journal: Geology
Published: 01 February 2008
Geology (2008) 36 (2): 175–178.
.... , 2000 , A critical reappraisal of the fossil record of the bilaterian phyla : Biological Reviews , v. 75 pp. 253 – 295 . Butterfield , N.J. , 2006 , Hooking some stem-group “worms”: Fossil lophotrochozoans in the Burgess Shale : BioEssays , v. 28 pp. 1161 – 1166 doi: 10.1002/bies...
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Journal Article
Journal: Geology
Published: 01 December 2005
Geology (2005) 33 (12): 929–932.
... not have evolved much earlier ( Butterfield, 2003 ). It is likely, then, that lecithotrophy is primitive for most groups, consistent with both the fossil record ( Chaffee and Lindberg, 1986 ) and several detailed phylogenetic studies that polarize the direction of evolutionary change ( Fig. 2A...
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A - and  B -site occupancy of aeschynite-<span class="search-highlight">group</span> minerals. Samples plotted: 1...
Published: 01 April 2008
F ig . 3. A - and B -site occupancy of aeschynite-group minerals. Samples plotted: 1 aeschynite-(Y), Triolet Valley, Aosta, Italy; 2 aeschynite-(Y), Miage moraine, Aosta, Italy; 3 aeschynite-(Y), Triolet Valley, Aosta, Italy; 4 aeschynite-(Y), Pizzo Cervandone, Novara, Italy; 5 aeschynite-(Y
Journal Article
Published: 01 March 2008
Journal of Paleontology (2008) 82 (2): 329–335.
... bacatensis Villarroel, 1987 from the ?middle Paleocene of Colombia than with any other Tertiary ungulate group of South America. Notoetayoa gargantuai fills an important gap in the knowledge of the mammalian faunas from the Paleocene of Patagonia, particularly of the poorly known pre-Itaborian times. 28...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1953
AAPG Bulletin (1953) 37 (5): 889–912.
... dolomite; the sequence is overlain by the Parting member of the Chaffee formation of Late Devonian age, less than 100 feet thick, which consists of bright green shale interbedded with very light tan blocky beds of quartzite and some dark gray and dull brown shale. This sequence is easily divisible...
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Journal Article
Published: 01 May 2011
Geochemistry: Exploration, Environment, Analysis (2011) 11 (2): 93–101.
... (130 km south of Cobar, Fig. 1 ) Pb> 30 ppm in 1–2 mm soil material (in an area at least 400 × 400 m) readily defines subcropping mineralization, whereas Zn >50 ppm in lag occurs only at isolated points within that area ( Table 1 ; Chaffee et al . 1989 ; Scott et al . 1991 ). The Hera Au–Cu...
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Journal Article
Journal: Paleobiology
Published: 01 May 2007
Paleobiology (2007) 33 (2): 227–247.
...Bruce J. Shockey; Darin A. Croft; Federico Anaya Abstract We use two approaches to test hypotheses regarding function in a group of extinct mammals (Family Mesotheriidae, Order Notoungulata) that lack any close extant relatives: a principle-derived paradigm method and empirically derived analog...
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Journal Article
Journal: Economic Geology
Published: 01 August 2003
Economic Geology (2003) 98 (5): 1003–1018.
..., it is common to group these non-specific Fe 2+ -bearing minerals on the basis of the relative intensity of the Fe 2+ absorption feature rather than to assign a specific phase. Near-IR radiation (~1–2.5 μ m in this study) absorbed by minerals and other materials is most commonly converted into molecular...
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Journal Article
Published: 01 January 2013
Rocky Mountain Geology (2013) 48 (1): 1–14.
... chromatography. These analyses were then used to calculate the ∊ Nd t for the two samples and were used in neodymium crustal index calculations ( DePaolo et al., 1992 ). Nathrop Domes peraluminous rhyolite Rio Grande Rift Ruby Mountain topaz rhyolite The Nathrop Domes are a group of four...
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