Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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Toulmin, P., III, 1975, Megabreccia in the Mount Aetna complex, Colorado: U.S. Geological Survey Professional Paper 975, p. 153. Toulmin, P., III, 1976, Oligocene volcanism near Mount Aetna, southern Sawatch Range, Colorado [abstr.]: Geological Society of America Abstracts With Programs, v. 8, no. 5, p. 640-641. Toulmin, P., III, and Hammarstrom, J.M., 1990, Geology of the Mount Aetna volcanic center, Chaffee and Gunnison Counties, Colorado: U.S. Geological Survey Bulletin 1864, 44 p., scale 1:24,000. Tweto, O., 1961, Late Cenozoic events of the Leadville district and upper Arkansas Valley, Colorado, in Short papers in the geologic and hydrologic science: U.S. Geological Survey Professional Paper 424-B, p. B133-B135 Tweto, O., 1975, Laramide (Late Cretaceous-Early Tertiary) orogeny in the southern Rocky Mountains, in Curtis, B.F., ed., Cenozoic history of the southern Rocky Mountains: Geological Society of America Memoir 144, p. 1-44. Tweto, O., 1977, Tectonic history of west-central Colorado, in Veal, H.K., ed., Exploration frontiers of the central and southern Rockies: Denver, Colo., Rocky Mountain Association of Geologists, p. 11-22. Tweto, O., 1979a, The Rio Grande rift system in Colorado, in Riecker, R.E., ed., Rio Grande Rift; Tectonics and magmatism: Washington, D.C., American Geophysical Union, p. 33-56. Tweto, O., 1979b, Geologic map of Colorado: U.S. Geological Survey, scale 1:500,000. Tweto, O., 1980a, Tectonic history of Colorado, in Kent, H.C., and Porter, K.W., eds, Colorado geology: Denver, Colo., Rocky Mountain Association of Geologists, Denver, Colorado- 1980 Symposium, p.5-9. Tweto, O., 1980b, Precambrian geology of Colorado, in Kent, H.C., and Porter, K.W., eds., Colorado geology: Rocky Mountain Association of Geologists, Denver, Colorado- 1980 Symposium, p. 37-46. Tweto, O., 1980c, Summary of Laramide orogeny in Colorado, in Kent, H.C., and Porter, K. W., eds,. Colorado geology: Rocky Mountain Association of Geologists, Denver, Colorado- 1980 Symposium, p. 129-134. 216
Tweto, O., 1987, Rock units of the Precambrian basement in Colorado: U.S. Geological Survey Professional Paper 1321-A, 54 p., 1 plate. Tweto, O., and Sims, P.K., 1963, Precambrian ancestry of the Colorado Mineral Belt: Geologic Society of America Bulletin, v. 74, p. 991-1014, 1 plate. Tweto, O., Steven, T.A., Hail, W.J., and Moench, R.H., 1976, Preliminary geologic map of the Montrose 1° x 2° quadrangle, southwestern Colorado: U.S. Geological Survey Miscellaneous Field Studies Map MF-761, scale 1:250,000. U.S. Forest Service, 1998, San Isabel National Forest, scale 1:126,720. U.S. Geological Survey 2002 National Seismic Hazard Maps source: http://eqint.cr.usgs.gov/eq-men/html/zipcode-06.html U.S. Geological Survey, NEIC Internet catalog of earthquakes, 1973-2003. http://neic.usgs.gov/neis/epic_circ.html U.S. Geological Survey, 2006 NWIS Web Data for Colorado: http://nwis.waterdata.usgs.gov/co/nwis, Internet site accessed in June, 2006. Unruh, J.R., Sawyer, T.L., and Lettis, W.R., 1992, Seismotectonic evaluation of Green Mountain dam, Shadow Mountain dam, Granby dam, and Willow Creek dam, Colorado-Big Thompson Project: Unpub. Preliminary Report prepared by William Lettis & Associates for U.S. Bureau of Reclamation, Denver, Colorado, 78 p. Van Alstine, R.E., 1968, Tertiary trough between the Arkansas and San Luis Valleys, Colorado, in Geological Survey research 1968: U.S. Geological Survey Professional Paper 600-C, p. C158-160. Van Alstine, R.E., 1969, Geology and mineral deposits of the Poncha Springs Northeast quadrangle, Chaffee County, Colorado: U.S. Geological Survey Professional Paper 626, 52 p., 6 plates. Van Alstine, R.E., 1970, Allochthonous Paleozoic blocks in the Tertiary San Luis-Upper Arkansas graben, Colorado, in Geological Survey research 1970: U.S. Geological Survey Professional Paper 700-B, p. B43-B51. Van Alstine, R.E., 1974, Geology and mineral deposits of the Poncha Springs SE quadrangle, Chaffee County, Colorado: U.S. Geological Survey Professional Paper 829, 19 p. 217
Page 1 and 2:
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
Page 89 and 90:
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).
Page 165 and 166: that truncates the Upper Arkansas g
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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: Stark, J.T., and Barnes, F.F., 1935
Page 219 and 220: quadrangle, Colorado: U.S. Geologic
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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