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Como West Quadrangle

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This topographic map is an excerpt from the Como West quadrangle, focused on the Hanna Formation in sections 5, 6, 7, and 8 of T. 23 N., R. 80 W. The base-map came from “Geology in vicinity of ‘The Breaks’ …” by Lillegraven et al. (2004, fig. 4B). The red-colored, solid lines and numbers (including the red line mostly overlapped by a black line passing through the southeastern corner of sec. 6) show the paths of legs 15, 16, and 17 (of 20 legs total) of a measured and described section through the entire Hanna Formation as it occurs in the northeastern Hanna Basin. Most relevant here is information within figures 4 and 11–13, along with appendix 1, in Lillegraven et al. (2004). Appropriate to that statement, legs 15–17 intersect Dobbin et al. (1929) coals 78–87, which are tracked here via dashed green lines. As determined from figure 3 in Dechesne et al. (2020), the beginning of their measured section called ‘The Breaks’ (as legs 1 and 2) is shown here as the nearly straight, uninterrupted black line in the north-central part of section 8. A reason for the division between legs 1 and 2 is not provided by Dechesne et al. (2020). Then, with a substantial jump to the northwest into the southwestern quadrant of section 5, the Dechesne et al. measured section (as black-lined leg 3) begins its up-section, southwestern traverse across the southeastern corner of section 6 into section 7. All of that transect from section 5 into sections 6 and 7 (ending just west of the two-track road up-section from coal 87) directly overlies, and thus mostly occludes, the Lillegraven et al. (2004) red-lined leg 17. All presentations of coal-bed distributions, as well as strike–dip measurements shown in this graphic, are from Lillegraven et al. (2004, fig. 4B, as enhanced via stratigraphic data from Dobbin et al., 1929, pl. 27). Mention is made here of the evidence for extensive bands of lacustrine deposition as presented by Lillegraven et al. (2004, appendix 1, p. 59–60) within descriptions of legs 16 and 17. The present figure adds light-blue bands to stratigraphic levels of the ‘lower’ and ‘upper lacustrine units’ as introduced in 2004. Notice the consistently strong dips to the southwest existing here in contrast to the relatively shallow dips to the northeast (Fig. 6) existing on the southwestern flank of the defining syncline of northeastern Hanna Basin.

This topographic map is an excerpt from the Como West quadrangle, focused o... Open Access

Published: 01 December 2020
Figure 8. This topographic map is an excerpt from the Como West quadrangle, focused on the Hanna Formation in sections 5, 6, 7, and 8 of T. 23 N., R. 80 W. The base-map came from “Geology in vicinity of ‘The Breaks’ …” by Lillegraven et al. (2004 , fig. 4B ). The red-colored, solid lines
Image
Geologic map of entire eastern margin of Hanna Basin and all but southern extremes of Carbon Basin. Map is bounded to east by western parts of Flat Top and Big Medicine Bow anticlines, to north by course of Medicine Bow River, and to south by U.S. Interstate Highway 80 at southern extreme of Simpson Ridge Anticline. Colored map at full 1:24,000 scale is presented in digital form suitable for printing as ‘Fig. 5.PDF’. A thumbnail version for quick reference, however, exists unscaled on following page. Indicated geological cross sections are presented using 1:24,000 scale in Figure 7 (note that transects D–L and J–K continue westward onto Fig. 6). Unless otherwise indicated, strike/dip measurements are by the author, and associated station numbers (e.g., ‘5745’) allow access to additional geographic and geologic information listed under those numbers in Appendices 1 and 2 (Table 2). Exceptions on this map include attitudinal measurements shown: (1) without station numbers in the map's northeastern corner (from Blevens, 1984); (2) as ‘Taylor’ in northern part of inset (from Taylor, 1996); (3) with initials ‘DBH’ (from Dobbin et al., 1929) in western parts of Como West quadrangle; and (4) without station numbers on core and eastern flanks of Simpson Ridge Anticline (from Kraatz, 2002). Inset of ‘The Breaks’ at northern edge of map is rescaled (original 1:12,000) from figure 4B of Lillegraven et al. (2004), with cross section P′–Q′ re-labelled here from the original as A–A′.

Geologic map of entire eastern margin of Hanna Basin and all but southern e... Open Access

Published: 01 July 2015
of Como West quadrangle; and (4) without station numbers on core and eastern flanks of Simpson Ridge Anticline (from Kraatz, 2002 ). Inset of ‘The Breaks’ at northern edge of map is rescaled (original 1:12,000) from figure 4 B of Lillegraven et al. (2004) , with cross section P′–Q′ re-labelled here
Image
This represents my additional effort to determine the exact locations of the five stratigraphic transects developed by Dechesne et al. (2020, fig. 3). Figure 5 of the present paper enhances the utility of those same five transects, here plotted onto the four relevant U.S. Geological Survey 7.5-minute topographic quadrangle maps (i.e., the TE Ranch, Difficulty, Elmo, and Como West quadrangles). Those transects from Dechesne et al. (2020) are designated as: A, ‘Doug’; B, ‘Big Channel Lateral’; C, ‘Hanna Draw’; D, ‘The Breaks’; and E, ‘Beer Mug Vista no. 2.’ Additionally, the site ‘F’ (in green) indicates a small segment of leg 4 (of 20 superposed legs of the local section of the Hanna Fm.; see Lillegraven et al., 2004, figs. 4 and 11, plus appendix 1). According to Dunn (2003), leg 4 (of Lillegraven et al., 2004) is an important part of the local stratigraphic column. That is because leg 4 has yielded palynomorphs characteristic elsewhere in the Rocky Mountain region of late-Paleocene, pollen-based zone P5 in the sense of Nichols and Ott (1978) and Nichols (2003, fig. 2). Dunn’s outcrop sample in leg 4 (no. EBP03; 2003, p. 99 and fig. 2.3) was collected from the Denver Museum of Nature & Science’s fossil-leaf locality DMNH I.2643. That fossiliferous locality itself was named ‘Beer Mug Vista’ at the time of collection. The identically named yet wholly different collecting area (i.e., sec. 31, T. 24 N., R. 80 W. at the northwestern extreme of The Breaks area) today is separated by 4.6 kilometers from the palynomorph-bearing locality in leg 4 recorded in 2003. This inexplicable duplication of nomenclature predictably is leading to unnecessary confusion. Therefore, I recommend that hereafter the 2003 site be called ‘Beer Mug Vista no. 1.’ To help readers grasp the asymmetrical configuration of the defining syncline of northeastern Hanna Basin, its mapped synclinal axial trace (from: Lillegraven, 2015, figs. 4 and 5; and Lillegraven et al., 2004, fig. 5), along with the approximate northern termination of the Hanna syncline, were added to the present map.

This represents my additional effort to determine the exact locations of th... Open Access

Published: 01 December 2020
. Geological Survey 7.5-minute topographic quadrangle maps (i.e., the TE Ranch, Difficulty, Elmo, and Como West quadrangles). Those transects from Dechesne et al. ( 2020 ) are designated as: A, ‘Doug’; B, ‘Big Channel Lateral’; C, ‘Hanna Draw’; D, ‘The Breaks’; and E, ‘Beer Mug Vista no. 2.’ Additionally
Journal Article

Geology and Mineral Deposits of the New World District, Park County, Montana Available to Purchase

Allan R. Kirk, Todd W. Johnson, James E. Elliott
Journal: SEG Discovery
Published: 01 January 1993
SEG Discovery (1993) (12): 1–16.
DOI: https://doi.org/10.5382/SEGnews.1993-12.fea
...Allan R. Kirk; Todd W. Johnson; James E. Elliott The recently discovered and previously known gold-copper-silver deposits of the New World district comprise five separate deposits: Como, Fisher Mountain, McLaren, Miller Creek, and Homestake ( Fig. 2 ). They extend for about 9,000 ft from...
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Stratigraphy of Northeastern and East-Central Parts of South Park, Colorado Available to Purchase

J. Harlan Johnson
Journal: AAPG Bulletin
Published: 01 September 1935
AAPG Bulletin (1935) 19 (9): 1339–1356.
DOI: https://doi.org/10.1306/3D932D68-16B1-11D7-8645000102C1865D
... Sec. 23, T. 9 S., R. 76 W., northward to Sec. 23, T. 8 S., R. 76 W. The shale probably extends farther north, but is covered by recent and Tertiary alluvial deposits. A small strip occurs along the west edge of the town of Como, and a third, about a mile long, has an east-west trend in Sec. 21, T. 9 S...
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Heterogenous late Miocene extension in the northern Walker Lane (California-Nevada, USA) demonstrates vertically decoupled crustal extension Open Access

Michael C. Say, Andrew V. Zuza
Journal: Geosphere
Published: 23 September 2021
Geosphere (2021) 17 (6): 1762–1785.
DOI: https://doi.org/10.1130/GES02409.1
... side by the Bull Canyon fault and intrudes the Como andesite (unit Tac) and reworked tuff (unit Tact) units (view looking west). 40 Ar/ 39 Ar age on the dacitic dike yielded 6.59 ± 0.06 Ma. (E) Brecciated, erosion-resistant northeast-striking fault plane in the northern range (view looking southwest...
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View PDF for article title, Heterogenous late Miocene extension in the northern Walker Lane (California-Nevada, USA) demonstrates vertically decoupled crustal extension
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Alternative viewpoints on the nature and importance of a prominent syncline at the northeastern edge of Wyoming’s Hanna Basin Open Access

Jason A. Lillegraven
Published: 01 December 2020
Rocky Mountain Geology (2020) 55 (2): 91–129.
DOI: https://doi.org/10.24872/rmgjournal.55.2.91
...Figure 8. This topographic map is an excerpt from the Como West quadrangle, focused on the Hanna Formation in sections 5, 6, 7, and 8 of T. 23 N., R. 80 W. The base-map came from “Geology in vicinity of ‘The Breaks’ …” by Lillegraven et al. (2004 , fig. 4B ). The red-colored, solid lines...
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View PDF for article title, Alternative viewpoints on the nature and importance of a prominent syncline at the northeastern edge of Wyoming’s Hanna Basin
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HENRY FAIRFIELD OSBORN AND JURASSIC DINOSAUR RECONNAISSANCE IN THE SAN JUAN BASIN, ALONG THE COLORADO-UTAH BORDER, 1893–1900 Available to Purchase

Paul D. Brinkman
Published: 01 October 2005
Earth Sciences History (2005) 24 (2): 159–174.
DOI: https://doi.org/10.17704/eshi.24.2.506p23j175171217
... dinosaur rush—Osborn sent two more expeditions to search the area. Both of these parties returned empty-handed also. Reliable locality data regarding the presence of typical Jurassic vertebrates would have been very useful to geologists like Whitman Cross, who was then attempting to correlate beds west...
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View PDF for article title, HENRY FAIRFIELD OSBORN AND JURASSIC DINOSAUR RECONNAISSANCE IN THE SAN JUAN BASIN, ALONG THE COLORADO-UTAH BORDER, 1893–1900
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Late Laramide tectonic fragmentation of the eastern greater Green River Basin, Wyoming Open Access

Jason A. Lillegraven
Published: 01 July 2015
Rocky Mountain Geology (2015) 50 (1): 30–118.
DOI: https://doi.org/10.2113/gsrocky.50.1.30
... of Como West quadrangle; and (4) without station numbers on core and eastern flanks of Simpson Ridge Anticline (from Kraatz, 2002 ). Inset of ‘The Breaks’ at northern edge of map is rescaled (original 1:12,000) from figure 4 B of Lillegraven et al. (2004) , with cross section P′–Q′ re-labelled here...
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Journal Article

SEG Newsletter 12 (January) Available to Purchase

Journal: SEG Discovery
Published: 01 January 1993
SEG Discovery (1993) (12): 1–24.
DOI: https://doi.org/10.5382/SEGnews.1993-12
... (Figs. 1, 2). The Como, Pisher Mountain, McLaren, I Miller Creek, and Homestake dep0slts rormed largely by replacement of Cambrian limestone adjacent to Tertiary intrusive I complexes and within a breccia pipe. In total these deposits contain I more than 12 million tons of geologic reserves that have...
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Petrologic, tectonic, and metallogenic evolution of the southern segment of the ancestral Cascades magmatic arc, California and Nevada Open Access

Edward A. du Bray, David A. John, Brian L. Cousens
Journal: Geosphere
Published: 01 February 2014
Geosphere (2014) 10 (1): 1–39.
DOI: https://doi.org/10.1130/GES00944.1
... L.J. Castor S.B. dePolo C.M. Davis D.A. Widmer M.C. , 2003 , Geology of the Fraser Flat Quadrangle and the west half of the Moses Rock Quadrangle : Nevada Bureau of Mines and Geology Map 146, scale 1 : 24,000 . GEOROC , 2010 , Geochemistry of rocks of the oceans...
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View PDF for article title, Petrologic, tectonic, and metallogenic evolution of the southern segment of the ancestral Cascades magmatic arc, California and Nevada
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SEG Newsletter 92 (January) Available to Purchase

Journal: SEG Discovery
Published: 01 January 2013
SEG Discovery (2013) (92): 1–60.
DOI: https://doi.org/10.5382/SEGnews.2013-92
... especialmente a partir de la década de académico/gobierno), d) el compromiso era sólo una cuestión de tiempo. 1990. Los líderes de la Sociedad de hace con los estudiantes de geología y 20 a 30 años fortalecieron para siempre jóvenes profesionales es el más alto en ¿Y cómo llegamos aquí? En 1998, la SEG al dar...
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Reworked Cretaceous elasmobranch teeth and provenance of the Paleocene Hanna Formation (Hanna Basin, Wyoming) Available to Purchase

John H. Burris
Published: 01 January 2001
Rocky Mountain Geology (2001) 36 (1): 37–48.
DOI: https://doi.org/10.2113/gsrocky.36.1.37
.... The Cretaceous clasts and teeth indicate a local, northerly source for part of the Hanna Formation in the northeastern Hanna Basin. The focus of present research is the northeastern corner of the Hanna Basin, in an area of badlands known as The Breaks (Como West 7.5 min topographic quadrangle). Although...
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View PDF for article title, Reworked Cretaceous elasmobranch teeth and provenance of the Paleocene Hanna Formation (Hanna Basin, Wyoming)
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Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton Open Access

Dominique Chardon, Ousmane Bamba, Kalidou Traoré
Published: 07 February 2020
Bulletin de la Société Géologique de France (2020) 191 (1): 2.
DOI: https://doi.org/10.1051/bsgf/2020001
... provinces to the soft Birimian lithosphere. Fig. 6 Fabric/shear zones mapping protocol at the scale of the southern West African craton ( Fig. 7 a) illustrated on the Comoé area in the Côte d’Ivoire − Ghana border region (location on Fig. 1 ): (a) fabric trajectories drawn after foliation...
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View PDF for article title, Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the <span class="search-highlight">West</span> African craton
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Breccia- and Carbonate-Hosted Au-Cu-Ag Replacement Mineralization Associated with the Homestake Porphyry Intrusive Complex, New World District, Montana Available to Purchase

Todd W. Johnson, Tommy B. Thompson
Journal: Economic Geology
Published: 01 August 2006
Economic Geology (2006) 101 (5): 955–980.
DOI: https://doi.org/10.2113/gsecongeo.101.5.955
... Metric tons (t) Au (g/t) Cu (%) Ag (g/t) Contained Au (kg) Contained Cu (t) Contained Ag (kg) 1 Open-pit resource 2 Underground resource Como 1 641,670 3.77 1.03 18.72 2,419 7,285 12,102 Fisher Mt. zone 1 303,180 6.48 0.28 38.74 1,965 936 11,745 McLaren 1...
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View PDF for article title, Breccia- and Carbonate-Hosted Au-Cu-Ag Replacement Mineralization Associated with the Homestake Porphyry Intrusive Complex, New World District, Montana
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Amber from Upper Cretaceous through Paleocene strata of the Hanna Basin, Wyoming, with evidence for source and taphonomy of fossil resins Available to Purchase

David A. Grimaldi, Jason A. Lillegraven, Thomas W. Wampler, Denise Bookwalter, Alexander Shedrinsky
Published: 01 January 2000
Rocky Mountain Geology (2000) 35 (2): 163–204.
DOI: https://doi.org/10.2113/35.2.163
...-shaped pieces Lillegraven and Snoke (1996 , fig. 13) provided a composite, summary description of the Hanna Formation in vicinity of The Breaks (Como West and Difficulty 7.5 min USGS topographic quadrangles). Their generalized measured section was based upon description of 20 superposed legs...
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View PDF for article title, Amber from Upper Cretaceous through Paleocene strata of the Hanna Basin, Wyoming, with evidence for source and taphonomy of fossil resins
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Miocene and Early Pliocene Epithermal Gold-Silver Deposits in the Northern Great Basin, Western United States: Characteristics, Distribution, and Relationship to Magmatism Available to Purchase

David A. John
Journal: Economic Geology
Published: 01 December 2001
Economic Geology (2001) 96 (8): 1827–1853.
DOI: https://doi.org/10.2113/gsecongeo.96.8.1827
... : Geological Society of America Bulletin , v. 82 , p. 3497 – 3502 . McKee , E.H. , and Klock , P.R. , 1984 , K-Ar ages of Cenozoic volcanic rocks, Walker Lake 1° X 2° quadrangle, eastern California and western Nevada : Isochron/West , no. 40 , p. 9 – 11 . McKee , E.H...
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View PDF for article title, Miocene and Early Pliocene Epithermal Gold-Silver Deposits in the Northern Great Basin, Western United States: Characteristics, Distribution, and Relationship to Magmatism
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The “Nazas Arc” is a continental rift province: Implications for Mesozoic tectonic reconstructions of the southwest Cordillera, U.S. and Mexico Open Access

C.J. Busby, E. Centeno-García
Journal: Geosphere
Published: 17 February 2022
Geosphere (2022) 18 (2): 647–669.
DOI: https://doi.org/10.1130/GES02443.1
... as a backarc basin behind the “Nazas arc.” The “Nazas arc” model also requires an east-dipping subduction zone under Mexico, and a separate west-dipping subduction zone under the oceanic arc rocks of western Mexico, which those models portray as an exotic arc, despite the presence of abundant detrital zircon...
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View PDF for article title, The “Nazas Arc” is a continental rift province: Implications for Mesozoic tectonic reconstructions of the southwest Cordillera, U.S. and Mexico
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Repeated megaturbidite deposition in Lake Crescent, Washington, USA, triggered by Holocene ruptures of the Lake Creek-Boundary Creek fault system Available to Purchase

Elana L. Leithold, Karl W. Wegmann, Delwayne R. Bohnenstiehl, Catelyn N. Joyner, Audrianna F. Pollen
Journal: GSA Bulletin
Published: 20 March 2019
GSA Bulletin (2019) 131 (11-12): 2039–2055.
DOI: https://doi.org/10.1130/B35076.1
... of the southern basin, a small, 80-m-deep subbasin is bordered to the east by another bathymetric sill that rises to within 65 m of the lake surface and to the west by a recessional moraine that formed during regional retreat of the Juan de Fuca Lobe of the Cordilleran ice sheet, ca. 14 ka ( Logan and Schuster...
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View PDF for article title, Repeated megaturbidite deposition in Lake Crescent, Washington, USA, triggered by Holocene ruptures of the Lake Creek-Boundary Creek fault system
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Crustal Profile of Mountain Belt: COCORP Deep Seismic Reflection Profiling in New England Appalachians and Implications for Architecture of Convergent Mountain Chains Available to Purchase

C. J. Ando, B. L. Czuchra, S. L. Klemperer, L. D. Brown, M. J. Cheadle, F. A. Cook, J. E. Oliver, S. Kaufman, T. Walsh, J. B. Thompson, Jr., J. B. Lyons, J. L. Rosenfeld
Journal: AAPG Bulletin
Published: 01 July 1984
AAPG Bulletin (1984) 68 (7): 819–837.
DOI: https://doi.org/10.1306/AD461430-16F7-11D7-8645000102C1865D
... the subcrop of the Paleozoic carbonate to clastic shelf sequence lying structurally beneath the Taconic allochthon. West of V.P. 200, shallow reflected energy is not abundant. The probable explanation for this is that just west of V.P. 200 the basal units of the shelf sequence and the flysch are exposed...
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View PDF for article title, Crustal Profile of Mountain Belt: COCORP Deep Seismic Reflection Profiling in New England Appalachians and Implications for Architecture of Convergent Mountain Chains
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