Interim Geologic Map of the West Part of - Utah Geological Survey

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Figure 1b. Close-up of area near pack in figure 1a. Note clastic dikes injected into baseof megabreccia.Figure 2a. Base of Markagunt megabreccia (exposed just south of Haycock Mountain onthe southeast side of an unnamed hill at the head of Little Coal Wash, NE1/4 section 6, T.36 S., R. 6 W.). The basal part of the megabreccia consists of about 30 feet (10 m) ofbrecciated, pulverized, and resilicified Isom Formation (Tm[Ti]), which grades abruptlyupward into fractured but otherwise undisturbed Isom Formation. Basal conglomerate is31
hidden by shadow; we tentatively assign underlying volcaniclastc sandstone to theLimerock Canyon Formation (Tl).Figure 2b. Close-up of brecciated and pulverized Isom Formation shown in figure 2a;Brunton compass for scale.Figure 2c. Close-up of slickenlinesexposed at the west side of figure2a. Slickenlines trend 20° NW. andplunge 30° on the base of themegabreccia, which forms a planarsurface that strikes N. 50° W. anddips 15° NE. Note basalconglomerate at base ofmegabreccia.32
Page 1 and 2: ! !! !!! ! ! !! ! ! ! !! ! !! !! !
Page 3 and 4: MAP UNIT DESCRIPTIONSQUATERNARYAllu
Page 5 and 6: Qafc Coalesced fan alluvium of Paro
Page 7 and 8: glacial deposits and features that
Page 9 and 10: (Tbhv) and Dakota (Kd and Ktd) Form
Page 11 and 12: typically mapped where lava flows d
Page 13 and 14: that range in age from Miocene to H
Page 15 and 16: fronts (except at Dry Valley, immed
Page 17 and 18: the quadrangle; no fault that postd
Page 19 and 20: Qbw, QbwcWater Canyon lava flow and
Page 21 and 22: others, 2007); lava flow is typical
Page 23 and 24: Mahogany Hill, about 500 feet (150
Page 25 and 26: lava flow (Tbbm) that conceal the u
Page 27 and 28: TERTIARYpreserved in down-dropped b
Page 29 and 30: and Rowley and others (in preparati
Page 31: field (or possibly coeval batholith
Page 35 and 36: esistant crystal-poor rhyolite tuff
Page 37 and 38: thickness uncertain but outcrop pat
Page 39 and 40: divide between Red Creek and Little
Page 41 and 42: pyroxene (5%), and sanidine (trace)
Page 43 and 44: unconformityThe Leach Canyon Format
Page 45 and 46: unconformityMa (Best and others, 19
Page 47 and 48: interval, and a lower limestone int
Page 49 and 50: Figure 3. View northwest to North V
Page 51 and 52: dark-yellowish-orange, grayish-pink
Page 53 and 54: TKgc Grand Castle Formation, undivi
Page 55 and 56: track (the latter found by Eric Rob
Page 57 and 58: noted by Moore and Straub (2001) an
Page 59 and 60: shoreface, beach, lagoonal, and est
Page 61 and 62: water deposits of Cenomanian age (N
Page 63 and 64: 62Figure 7. Cedar Mountain Formatio
Page 65 and 66: leached white under the Cretaceous
Page 67 and 68: ACKNOWLEDGMENTSThis geologic map is
Page 69 and 70: Anderson, R.E., and Christenson, G.
Page 71 and 72: Biek, R.F., Rowley, P.D., Hayden, J
Page 73 and 74: field guide (The Mackin Volume): Ut
Page 75 and 76: 2001, Cretaceous and early Tertiary
Page 77 and 78: Hacker, D.B., Rowley, P.D., Blank,
Page 79 and 80: Kurlich, R.A., III, 1990, Geology o
Page 81 and 82: Maldonado, F., and Moore, R.C., 199
Page 83 and 84:
Flagstaff-Green River basins [abs.]
Page 85 and 86:
elation to other igneous centers in
Page 87 and 88:
Schulman, E., 1956, Dendroclimatic
Page 89:
Van Kooten, G.K., 1988, Structure a
Page 92:
113°00'112°00'15BV20R i v e rCCNP
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Interim Geologic Map of the West Part of - Utah Geological Survey

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