Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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Van Alstine, R.E., and Lewis, G.E., 1960, Pliocene sediments near Salida, Chaffee County, Colorado, in Short papers in the geological sciences: U.S. Geological Survey Professional Paper 400-B, p. B245. Vanderwilt, J.W., 1947, Mineral resources of Colorado: Denver, Colo., Colorado Mineral Resources Board, 48 p. Varga, R.J., and Smith, B.M., 1984, Evolution of the early Oligocene Bonanza caldera, north San Juan volcanic field, Colorado: Journal Geophysical Research, v. 89, no. B10, p. 8810-8841. Wallace, C.A., Cappa, J.A., and Lawson, A.D., 1997, Geologic map of the Salida East quadrangle, Chaffee and Fremont Counties, Colorado: Colorado Geological Survey Open-File Report 97-6, 27 p., scale 1:24,000. Wallace, C.A., Cappa, J.A., and Lawson, A.D., 1999, Geologic map of the Gribbles Park quadrangle, Park and Fremont Counties, Colorado: Colorado Geological Survey Open-File Report 99-3, 21 p., scale 1:24,000. Wallace, C.A., Apeland, A.D., and Cappa, J.A., 2000, Geologic map of the Jack Hall Mountain quadrangle, Fremont County, Colorado: Colorado Geological Survey Open-File Report 2000-1, 27 p., scale 1:24,000. Wallace, C.A., and Keller, J.W., 2003, Geologic map of the Castle Rock Gulch quadrangle, Chaffee and Park Counties, Colorado: Colorado Geological Survey Open-File Report 2003-1, 65 p., scale 1:24,000. Wallace, C.A., and Lawson, A.D., 1998, Geologic map of the Cameron Mountain quadrangle, Chaffee, Park, and Fremont Counties, Colorado, Colorado Geological Survey Open-File Report 98-4, 23 p., scale 1:24,000. Widmann, B.L., Kirkham, R.M., and Rogers, W.P., 1998, Preliminary Quaternary fault and fold map and database of Colorado: Colorado Geological Survey Open-File Report 98-8, 331 p. Witkind, I.J., 1976, Preliminary map showing known and suspected active faults in Colorado: U.S. Geological Survey Open-File Report 76-154. Wrucke, C.T., 1974, The Whitehorn Granodiorite of the Arkansas Valley in central Colorado: U.S. Geological Survey Bulletin 1394-H, p. 1-7. Wrucke, C.T., and Dings, M.G., 1979, Geologic map of the Cameron Mountain 218
quadrangle, Colorado: U.S. Geological Survey Open-File Report 79-660, scale 1:62,500. Xu, T., 2001, Sedimentology and stratigraphy of Tertiary continental deposits in the Poncha Pass transfer zone and adjacent area, Colorado: Manhattan, Kansas, Kansas State University, M.Sc. thesis, 90 p. Xu, T., Oviatt, J., and Hubbard, M., 2001, Sedimentology and stratigraphy of Tertiary continental deposits of the Poncha Pass transfer zone and adjacent area, Colorado [abstr.]: Geological Society of America, Abstracts With Programs, v. 33, no. 6, p. A-74. 219
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OPEN-FILE REPORT 06-10 Geologic Map
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TABLE OF CONTENTS Introduction…
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mylonitic, augen textures………
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INTRODUCTION LOCATION AND ACCESS Th
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SAWATCH RANGE RIFT-SHOULDER UPLIFT
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of the South Arkansas River (subseq
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EXPLANATION Rio Grande Rift Neogene
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in descriptions of the geologic uni
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During the Early and Middle Paleozo
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Mountains, and White River uplifts
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field are the largest remnants of t
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Figure 5. Detailed geologic-structu
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with the Colorado mineral belt (Boo
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Shannon, 2005). Widmann and others
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the Upper Arkansas graben (fig. 5)
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15-minute quadrangle, which is adja
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etween the northern and southern se
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on U.S. Forest Service color aerial
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We use fractional map units on the
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Qpt Pinedale till, undivided (late
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weathered, but Mount Princeton quar
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stratified, matrix-supported, bould
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as rockfalls, rock avalanches, rock
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stream-channel deposits of all pere
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Figure 10. View west up South Arkan
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Figure 11. View west up South Arkan
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valley near the eastern map boundar
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lithologies are variable and depend
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Arkansas River in parts of Redman C
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angular to subangular. Deposits gen
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elations, age constraints from foss
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elated to the inferred Squaw Creek
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Figure 14. Crude bedding in coarse
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microcline, and muscovite. The latt
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Volcanic Ash Figure 17. View of eas
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Figure 18. Close-up view of intense
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The western zone of brecciated Pale
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Tr Rhyolite dikes (early to late Ol
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as the overall N47°E trend of the
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One age determination on the rhyoli
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northwest-trending fault. Thus, fie
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on the North Fork leucogranite intr
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A small 400 by 400 foot body of Nor
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N12°E, 62°NW (about 6,000 ft sout
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The age of the quartz latite porphy
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Tma Mount Aetna quartz monzonite po
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of the Maysville quadrangle and the
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Mount Aetna ring dikes (Tma), one i
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the margins of the pluton, includin
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Shannon (1988). The average of seve
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indicating a granite b composition
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analysis by Crawford (1913), two an
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locally tanish to pinkish gray. It
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quadrangle (tables 1 and 3) were fr
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slices of Paleozoic sedimentary roc
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south-southwest of Maysville is a 9
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There is one additional Paleozoic s
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near the southwest margin of the qu
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eastern contact of the diorite intr
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endoskarn zones. The two widely sep
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Xhig) along the southeastern contac
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Xgd Granodiorite (Early Proterozoic
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Hybrid granodiorite is locally deve
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Xcs Calc-silicate gneiss (Early Pro
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Many of the calc-silicate gneiss zo
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typically expressed by intermittent
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The field relations and characteris
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the north side of all three segment
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eplaced by muscovite. The western m
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sillimanite-quartz-muscovite that a
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sillimanite gneiss (Xmsg) and the m
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Figure 35. Outcrop of Proterozoic h
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samples) indicates they are compose
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Xal Lineated amphibolite (Early Pro
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of the Proterozoic metamorphic rock
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that the present structural configu
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elated to rotation of domain blocks
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sometimes terminate at a cross stru
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limestone that is exposed in a wind
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quadrangle are intimately associate
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of the quadrangle. The north-northw
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quartz monzonite ring dikes (Tma).
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that truncates the Upper Arkansas g
Page 167 and 168: as at the mouth of Squaw Creek. How
Page 169 and 170: adjacent to the southwestern edge o
Page 171 and 172: graben and the Upper Arkansas Valle
Page 173 and 174: GEOLOGIC HAZARDS Potential geologic
Page 175 and 176: In addition, older landslides may h
Page 177 and 178: sparse vegetation. One such area is
Page 179 and 180: Table 7. Historical (pre-instrument
Page 181 and 182: 4262272N. ECONOMIC GEOLOGY Currentl
Page 183 and 184: A number of the larger pegmatite bo
Page 185 and 186: River placers near Buena Vista (Van
Page 187 and 188: The small mines and prospects along
Page 189 and 190: elatively recent (post-1970) explor
Page 191 and 192: contact of two Quaternary gravels (
Page 193 and 194: quadrangle. The first area is a clu
Page 195 and 196: y Sharp (1976) to be a fault slice
Page 197 and 198: quadrant of the Maysville quadrangl
Page 199 and 200: the large Paleozoic rock outlier) i
Page 201 and 202: WATER RESOURCES Water resources on
Page 203 and 204: water near Maysville is being produ
Page 205 and 206: to Rudy C. Epis: Colorado School of
Page 207 and 208: University, M.Sc. thesis, 50 p. Din
Page 209 and 210: Hutchinson, R.M., and Hedge, C.E.,
Page 211 and 212: Litsey, L.R., 1958, Stratigraphy an
Page 213 and 214: County, Colorado, in Berg, R.R., an
Page 215 and 216: Stark, J.T., and Barnes, F.F., 1935
Page 217: Tweto, O., 1987, Rock units of the
Page 221 and 222: 94A 391996 4263422 Prospect YXp;Xbf
Page 223 and 224: 336A 396189 4274961 Prospect Xgdf B
Page 225: 854 391849 4268852 42 Adit; Geochem
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Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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