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Utah Geological Survey
Utah Department of Natural Resourcesa division of
Open-File Report 406Interim Geologic Map of theCave Flat Quadrangle, Utah
Geology digitized from paper copy by Angela Wadman
This release makes information available to the public during the reviewand production period necessary for a formal UGS publication. Becausethe release is subject to review and may not conform to UGS policy andeditorial standards, it may be premature for an individual or group to takeaction based on the contents. This material will not be reproduced whenthe final product has been released.
INTERIM GEOLOGIC MAP OF THE CAVE FLAT (MT. PENNEL 2 NW)QUADRANGLE, GARFIELD COUNTY, UTAH
by CURTIS SMITH2003
Geology by Curtis Smith, 1981-1982
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Swap Canyon Swap Mesa
Tarantula Mesa
Muley Canyon Cave Flat
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Open-File Report 406Interim Geologic Map of theCave Flat Quadrangle, Utah
INTERIM GEOLOGIC MAP OF THE CAVE FLAT (MT. PENNEL 2 NW)QUADRANGLE, GARFIELD COUNTY, UTAH
by CURTIS SMITH2003
INTERIM GEOLOGIC MAP OF THE CAVE FLAT (MT. PENNELL 2 NW) QUADRANGLE,GARFIELD COUNTY, UTAH
Curtis Smith
This open-file release makes information available to the public during the review andproduction period necessary for a formal UGS publication. Because the release is subject toreview and may not conform to UGS policy and editorial standards, it may be premature for anindividual or group to take action based on the contents. This material will not be reproducedwhen the final product has been released.
OPEN-FILE REPORT 406 March 2003 UTAH GEOLOGICAL SURVEY a division of UTAH DEPARTMENT OF NATURAL RESOURCES
IHS Energy5333 Westheimer
Houston, TX 77056
MAP AND CROSS-SECTION UNITSCave Flat (Mt. Pennell 2 NW) 7.5' quadrangle, Garfield County, Utah
Quaternary DepositsQe Windblown sand and loess
Qal Stream alluvium
Qap? Pediment-mantle(?) gravel
Cretaceous RocksKb Beds on Tarantula Mesa (Kaiparowits? Formation)
Ktmu Upper part Tarantula Mesa Sandstone (Ktm-2 of Smith, 1983)
Ktml Lower part Tarantula Mesa Sandstone (Ktm-1 of Smith, 1983)
Kmmu Upper part Masuk Shale Member of Mancos Shale (Kmm-2 of Smith, 1983)
Kmml Lower part Masuk Shale Member of Mancos Shale (Kmm-1 of Smith, 1983)
Kmus Upper fluvial sandstone of Muley Canyon Sandstone Member of Mancos Shale(Kmmc-3 of Smith, 1983)
Kmc Coal interval of Muley Canyon Sandstone Member of Mancos Shale (Kmmc-2 ofSmith, 1983)
Kmcu Upper coal interval of Muley Canyon Sandstone Member of Mancos Shale (Kmmc-2cof Smith, 1983)
Kmcs Sandstone of coal interval of Muley Canyon Sandstone Member of Mancos Shale(Kmmc-2b of Smith, 1983)
Kmcl Lower coal interval of Muley Canyon Sandstone Member of Mancos Shale (Kmmc-2a of Smith, 1983)
Kmls Lower massive sandstone of Muley Canyon Sandstone Member of Mancos Shale(Kmmc-1 of Smith, 1983)
Kbgu Upper part Bluegate Shale Member of Mancos Shale (Kmbg-2 of Smith, 1983)
Kbgl Lower part Bluegate Shale Member of Mancos Shale (Kmbg-1 of Smith, 1983)
Cretaceous Rocks on Cross SectionsKtm Tarantula Mesa Sandstone
Kmm Masuk Shale Member of Mancos Shale
Kmmc Muley Canyon Sandstone Member of Mancos Shale
Kmbg Bluegate Shale Member of Mancos Shale
Kmf Ferron Sandstone Member of Mancos Shale
Kmt Tununk Shale Member of Mancos Shale
Kd Dakota Formation
Cretaceous and Jurassic Rocks on Cross SectionsKJcm Cedar Mountain and Morrison Formations
Jurassic Rocks on Cross SectionsJsc Summerville and Curtis Formations
Je Entrada Formation
Jca Carmel Formation
Jn Navajo Sandstone (and Page Sandstone?)
Jk Kayenta Formation
Jurassic and Triassic Rocks on Cross SectionsJw Wingate Sandstone
REFERENCESCave Flat quadrangleSmith, Curtis, 1983, Geology, depositional environments, and coal resources of the Mt. Pennell 2
NW [Cave Flat] quadrangle, Garfield County, Utah: Provo, Brigham Young UniversityGeology Studies, v. 30, part 1, p. 145-169.
Billingsley, G.H., Jr., Huntoon, P.W., and Breed, W.J., 1987, Geologic map of Capital ReefNational Park and vicinity, Utah: Utah Geological and Mineral Survey Map 87, scale1:62,500.
A5
SMITH APPENDIX
These are the measured sections that Smith (1983) stated were the appendix to his paper and were available
from Brigham Young University. Note however that not all measured sections shown on figure 10 in Smith (1983)
are in his appendix.
Measured section A:
Blue Gate Shale Member of M ancos Shale measured east of Stevens Narrows (Mount E llen 15 ' quadrangle) with
Loren Morton.
Unit Description Thickness Total
Muley Canyon Sandstone Member of Mancos Shale:
Sandstone: yellowish gray, weathers to grayish orange, very fine subrounded 5.0 m 5.0+ m
grains, moderately well sorted, laminated to very thin bedding, cliff former.
Blue Gate Shale
8 Sandstone and shale: interbedded. 28.0 m 465.0 m
Shale: dark gray, weathers to light gray soil, laminated, gypsiferous,
forms punky soil, slope former.
Sandstone: yellowish gray, weathers to grayish orange, very fine subangular
grains, moderately well sorted, very thin bedded to laminated, ripple
laminations, cross laminations, wood and plant fragments along bedding
planes, forms shoulders and ledges, weathers to a platy rubble, gypsum,
iron-oxide, and calcite cement.
7 Shale: dark gray, weathers to a light gray soil, laminated, 24.0 m 437.0 m
gypsiferous, forms punky soil, slope former.
6 Shale and siltstone: interbedded. 79.0 m 413.0 m
Shale: dark gray, weathers to a bluish gray soil, laminated to thinly
laminated, bentonitic, gypsiferous, papery to shaly, forms slope.
Siltstone: brown, weathers to grayish orange, laminated to very thin bedded,
forms ledges or produces p laty rubble on surface, iron-oxide and calcite
cement; siltstone beds are 1-3 meters thick and occur every 15-20 meters.
5 Shale: brownish black, weathers bluish gray, highly calcareous and 100.0 m 334.0 m
gypsiferous, contains bentonitic beds, laminated, papery, forms slope; several
thin to medium beds of calcareous siltstone present.
4 Silty mudstone: interbedded olive brown and medium gray, weathers 31.0 m 234.0 m
to light orange-brown, contains calcite, hematite, limonite, and gypsum, forms
slope near base of cuesta.
A6
3 Shale: poorly exposed, olive brown, weathers to grayish brown, 170.0 m 203.0 m
gypsiferous, contains bentonitic, carbonaceous, and silty horizons,
poorly preserved pelecypods, slope former.
2 Shale: dark gray, weathers to b luish gray soil, carbonaceous, 33.0 m 33.0 m
calcareous, thinly laminated to laminated, forms slope and badlands
topography.
1 Pebbly sandstone: yellowish gray, weathers lighter, medium to coarse 0.1 m 0.1 m