GEOLEX

Summary of Citation: Moenkopi

Publication:
Ward, L.F., 1901, Geology of the Little Colorado Valley: American
   Journal of Science, 4th series, v. 12, no. 72, p. 401-413

Usage in Publication:
Moencopie beds*

Modifications:	Geologic Province:	Dominant Lithology:
Named	Plateau sedimentary province	Shale Sandstone

Summary:
Named for its development at mouth of Moencopie Wash, Coconino Co, AZ in the Plateau sedimentary province. No type locality designated. Overlies Carboniferous limestone or sandstone of the "Upper Aubrey" unconformably. Underlies Shinarump conglomerate. Has a maximum "observed" thickness of 600-700 ft. Consists of (ascending order): dark red-brown, soft, laminated, saliferous shale; white calcareous shale; dark-brown, argillaceous shale; dark-brown, soft, argillaceous sandstone; and dark chocolate-brown, argillaceous, saliferous shale. Gypsum occurs as thin sheets and veins. Forms low ridges, buttresses, isolated knolls or buttes. The sandstone forms ledges. White impure limestone present in lower part. Dark brown argillaceous shale marks extreme upper and lower parts of the Moencopie. Mesozoic age.

Summary of Citation: Moenkopi

Publication:
Darton, N.H., 1910, A reconnaissance of parts of northwestern
   New Mexico and northern Arizona: U.S. Geological Survey
   Bulletin, 435, 88 p., (incl. geologic map, scale
   1:1,000,000)

Usage in Publication:
Moencopie formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Plateau sedimentary province Black Mesa basin San Juan basin

Summary:
Revised in that Moencopie formation unconformably overlies the newly named Kaibab limestone of the Aubrey group in Coconino Co, AZ in the Plateau sedimentary province. Mapped (geologic map) in Coconino Co, AZ in the Plateau sedimentary province, Navajo and Apache Cos, AZ in the Black Mesa basin, and McKinley, Valencia, and Sandoval Cos, NM in the San Juan basin. Underlies Shinarump conglomerate. Ranges from 500-700 ft thick in northern AZ, and from 200-600 ft thick in northwest NM. Assigned to the Permian.

Summary of Citation: Moenkopi

Publication:
Woodruff, E.G., 1912, Geology of the San Juan oil field, Utah,
   IN Contributions to economic geology, 1910; Part 2, Mineral
   fuels: U.S. Geological Survey Bulletin, 471-A, p. 76-104

Usage in Publication:
Moencopie formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Paradox basin

Summary:
Mapped (geologic map, cross sections) in southeast UT in the Paradox basin where it is divided into a lower 1,200 ft thick red sandy shale and tan massive sandstone unit and the overlying newly named Oljato sandstone member. Oljato is a 20 to 380 ft thick tan massive sandstone. Gypsum is scattered throughout the formation but rarely as massive beds. Lower part of the Moencopie 400+ ft is lithologically uniform in character in the San Juan field. The upper part of the Moencopie is soft pink sandy shale interbedded with dark shaly sandstone in south and tan colored sandstones in the north. Lower contact revised in that Moencopie overlies the newly named Goodridge formation. Underlies Dolores shale. Topographic forms vary in different parts of field from soft exposures to escarpments, spires, and turrets. Tentatively assigned to the Permian.

Summary of Citation: Moenkopi

Publication:
Gregory, H.E. and Stone, R.W., 1917, Geology of the Navajo
   country; a reconnaissance of parts of Arizona, New Mexico,
   and Utah: U.S. Geological Survey Professional Paper, 93, 161
   p.

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Plateau sedimentary province Paradox basin Black Mesa basin	Shale Sandstone

Summary:
Author proposes "to substitute" section in wall of Little Colorado Canyon, about 5 mi below Tanner Crossing, Coconino Co, AZ, Plateau sedimentary province, as the "type locality" of Moenkopi, replacing section at Moenkopi Wash. The section of Moenkopi on Little Colorado is complete--the formation is 389 ft thick; it unconformably overlies Pennsylvanian Kaibab limestone and unconformably underlies Triassic Shinarump conglomerate. The Tanner Crossing section consists of: 1) dark red, red-brown, red-gray to chocolate-colored shale, individual beds of which may be arenaceous, micaceous, calcareous, argillaceous, ripple marked, mud-cracked, sunbaked with worm casts and white blotches; and 2) chocolate, red to red-brown, fine-grained quartz sandstone, some beds of which may have calcareous cement, may be micaceous, cross-bedded, mudcracked, ripple marked. Occurs also (geologic map) in Navajo and Apache Cos, AZ, Black Mesa basin, and north into San Juan Co, UT, Paradox basin. Partial measured sections described. In general, bedding is irregular, laminae are discontinuous. Becomes calcareous upward, gypsum present in horizontal and vertical seams, mud cracks prominent. Permian? age assigned. Fossil plants and gastropods.

Summary of Citation: Moenkopi

Publication:
Bassler, Harvey and Reeside, J.B., Jr., 1921, Oil prospects in
   Washington County, Utah, IN Contributions to economic geology,
   1921; Part 2, Mineral fuels: U.S. Geological Survey Bulletin,
   726-C, p. C87-C107

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Great Basin province

Summary:
Is a Lower Triassic formation 1,800 to 2,000 ft thick in report area, Washington Co, UT and Mohave Co, AZ in the Great Basin province, that unconformably overlies the newly named Harrisburg gypsiferous member of the Permian Kaibab limestone and unconformably underlies the Triassic Shinarump conglomerate. Three new members named--Rock Canyon conglomeratic member at base, Virgin limestone member 335 to 530 ft above base, and the Shnabkaib shale member 930 to 1,010 ft above the base. These three members are separated by unnamed units composed of brick-red sandstone and shale with gypsum.

Summary of Citation: Moenkopi

Publication:
Hager, Dorsey, 1922, Oil possibilities of the Holbrook area in
   northeast Arizona: Mining and Oil Bulletin, v. 8, no. 2, p.
   71-74, 81, 94, Also, 1922, v. 8, no. 1, p. 23-26, 33-34; no.
   3, p. 135-140.

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Black Mesa basin

Summary:
Conformably overlies Kaibab limestone, or where Kaibab is missing, on the Coconino sandstone. Underlies Shinarump conglomerate. Divided into 3 parts. Lower 6 to 8 ft red shale and tan sandstone named Salt Creek member. Middle red shale includes gypsum beds near middle is unnamed. Upper gray cross-bedded sandstone named Holbrook sandstone [an unranked unit]. Thickness of middle member and Holbrook not stated. Permian age. Diagrammatic sketch.

Summary of Citation: Moenkopi

Publication:
Gilluly, James and Reeside, J.B., Jr., 1928, Sedimentary rocks
   of the San Rafael Swell and some adjacent areas in eastern
   Utah, IN Shorter contributions to general geology, 1927: U.S.
   Geological Survey Professional Paper, 150-D, p. D61-D110

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Paradox basin

Summary:
Divided into three parts because a middle unit, named in this report, Sinbad limestone member, is distinguished. Crops out over a wide area in the Waterpocket fold, San Rafael Swell, Elaterite Basin, and canyons of tributaries of the Green River. Is younger than the Kaibab limestone and older than the Shinarump conglomerate. Is of marine (Sinbad) and continental origin. Deposited in the Early Triassic. Sinbad member is fossiliferous. Correlates with the Woodside, Thaynes, and Ankareh formations of the western Uinta Mountains.

Summary of Citation: Moenkopi

Publication:
Gregory, H.E., 1948, Geology and geography of central Kane
   County, Utah: Geological Society of America Bulletin, v. 59,
   no. 3, p. 211-247

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Plateau sedimentary province

Summary:
Lower contact revised; member name applied for first time. Unconformably overlies Kaibab limestone. Name Timpoweap member (first published use) applied to basal 170 ft. Timpoweap includes a lower conglomerate and breccia, a middle gray, buff, hard, fossiliferous limestone, and an upper yellow, white, brown, red ferruginous, arenaceous shale. These rocks have been included with the Kaibab by some workers. Moenkopi mapped (geologic map) as an undivided unit on Kaibab Plateau--west of Red Rock valley and the Coxcomb, and east of Shinarump and Vermilion cliffs--Kane Co, UT, Plateau sedimentary province. Shown on map as extending southward into north-central AZ. Six members of Moenkopi recognized (ascending): Timpoweap, lower red, Virgin limestone, middle red, Shnabkaib, and upper red. Much of the formation is covered in study area. Unconformably underlies Shinarump conglomerate. Fossils (undetermined gastropods, ammonites) in Timpoweap and Virgin. Early Triassic age.

Summary of Citation: Moenkopi

Publication:
McKee, E.D., 1951, Triassic deposits of the Arizona-New Mexico
   border area, IN Smith, C.T., and Silver, Caswell, eds.,
   Guidebook of the San Juan basin [covering south and west
   sides], New Mexico and Arizona: New Mexico Geological Society
   Guidebook, no. 2, p. 85

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified Revised	Plateau sedimentary province Black Mesa basin

Summary:
Divided into three members which are, in ascending order, Wupatki (first used), Winslow (revised) and Holbrook (revised). Study area is Little Colorado River area of northeastern AZ, Coconino and Navajo Cos, Plateau sedimentary province and Black Mesa basin. Generalized section. Unconformably overlies Kaibab limestone; unconformably underlies Shinarump conglomerate [member] of Chinle formation. Assigned Early and Middle? Triassic age; Middle? Triassic age based on vertebrate fossil (Cyclotosaurus) which belongs to Middle Triassic in Europe and reptilian tracks which are similar to species from Middle Triassic in Old World.

Summary of Citation: Moenkopi

Publication:
Robeck, R.C., 1956, Temple Mountain member; new member of Chinle
   formation in San Rafael Swell, Utah: American Association of
   Petroleum Geologists Bulletin, v. 40, no. 10, p. 2499-2506

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Paradox basin

Summary:
Revised in that Lower and Middle? Triassic Moenkopi formation unconformably underlies the newly named Temple Mountain member, basal member of the Chinle formation in San Rafael Swell area, Emery Co, UT, Paradox basin. Temple Mountain member of this report was called purple and white unit, mottled unit, and pinto bed in earlier reports. The purple ledge or slope of Temple Mountain contrasts with brown-red ledgy slope of the Chinle. Geologic map.

Summary of Citation: Moenkopi

Publication:
Cooley, M.E., 1958, The Mesa Redondo member of the Chinle
   formation, Apache and Navajo Counties, Arizona: Plateau, v.
   31, no. 1, p. 7-15

Usage in Publication:
Moenkopi formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Black Mesa basin

Summary:
Upper contact of Holbrook member of Moenkopi formation with Upper Triassic Chinle formation revised locally in northeast AZ, in the Black Mesa basin, between Holbrook in Navajo Co east to Petrified Forest National Monument, St. Johns and Concho, Apache Co. In these areas the Holbrook, where the Shinarump member of the Chinle is missing, unconformably underlies the newly named Mesa Redondo member of Chinle. The upper contact is placed at the top of an erosional bleached zone that has a local relief of 1 to 15 ft. The Holbrook-Mesa Redondo contact is between red, thin to flat and lenticular bedded mudstone and siltstone (Holbrook) with gray, very fine grained, irregular bedded, well-cemented, siliceous, subround to subangular clear quartz sandstone that has black accessory minerals (Mesa Redondo). Of Middle? and Early Triassic age.

Summary of Citation: Moenkopi

Publication:
Shoemaker, E.M. and Newman, W.L., 1959, Moenkopi formation
   (Triassic? and Triassic) in Salt anticline region, Colorado
   and Utah: American Association of Petroleum Geologists
   Bulletin, v. 43, no. 8, p. 1835-1851

Usage in Publication:
Moenkopi formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Piceance basin Uinta basin

Summary:
Divided into four newly named members (ascending order): Tenderfoot, Ali Baba, Sewemup, and Pariott members in the Salt anticline area of Mesa Co, CO in the Piceance basin and in Grand Co, UT in the Uinta basin. Assigned a Triassic? and Triassic age.

Summary of Citation: Moenkopi

Publication:
Stewart, J.H., 1959, Stratigraphic relations of Hoskinnini member
   (Triassic?) of Moenkopi formation on Colorado Plateau: American
   Association of Petroleum Geologists Bulletin, v. 43, no. 8,
   p. 1852-1868

Usage in Publication:
Moenkopi formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Black Mesa basin Paradox basin

Summary:
Lower contact revised in the area between Moab, UT in the Paradox basin south to Kayenta, AZ in the Black Mesa basin to include a Hoskinnini member which is equivalent to the Tenderfoot member, basal member of the Moenkopi in the salt anticline area. Hoskinnini was formerly designated the upper or Hoskinnini tongue of the Cutler formation. As revised the age of the Moenkopi changed to Early and Middle? Triassic.

Summary of Citation: Moenkopi

Publication:
Schell, E.M. and Yochelson, E.L., 1966, Permian-Triassic boundary
   in eastern Uintah County, Utah, IN Geological Survey research
   1966: U.S. Geological Survey Professional Paper, 550-D, p.
   D64-D68

Usage in Publication:
Moenkopi Formation*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Uinta basin Greater Green River basin

Summary:
Triassic Moenkopi-Permian Park City contact modified on the south flank of the Uinta Mountains from Ashley Creek, Uintah Co, UT in the Uinta basin east to Red Rock Canyon, Moffat Co, CO in the Greater Green River basin. A 25 to 67 ft thick unit called the tawny beds, formerly mapped as part of the Moenkopi, are removed from Moenkopi and reassigned to the upper unit of the Franson Member of the Park City Formation. The tawny beds consist of gray silty limestone and dolomite. A very fine grained, hard, ledge-forming dolomite or limestone marker bed (4 ft thick) is distinguishable 10 to 30 ft below the top of the tawny beds. The marker bed is as much as 4 ft thick and contains phosphatic bioclastic debris, abundant fine to very coarse phosphorite pellets, glauconite, silt, sand, and sparse chert beds less than 1 ft thick. The marker bed can be traced (cross section) from Ashley Creek to Red Rock Canyon. A fossiliferous limestone 0.5 to 3.5 ft thick and 5 to 10 ft below the marker bed at Split Mountain has yielded Permian fossils (bryozoans, brachiopods, ammonoids, gastropods, etc, listed). Basal beds of overlying Moenkopi distinguished by interbedded red-brown and yellow-gray calcareous siltstone that are ripple marked and have gypsum veinlets.

Summary of Citation: Moenkopi

Publication:
Blakey, R.C., 1974, Stratigraphic and depositional analysis of
   the Moenkopi Formation, southeastern Utah: Utah Geological
   and Mineral Survey Bulletin, no. 104, 81 p.

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Paradox basin Plateau sedimentary province

Summary:
Divided into four members (ascending order): Black Dragon Member (new), Sinbad Limestone Member, Torrey Member (new), and Moody Canyon Member (new). Areal limits of all shown on figures. Deposited on a broad shelf between highlands and miogeosyncline under a variety of marine and paralic conditions. Assigned an Early and Middle? Triassic age. MEEKOCERAS fauna (Early Triassic, Smithian) found in San Rafael Swell, Teasdale uplift, and northwest Monument upwarp in the Paradox basin and Plateau sedimentary province. Lower contact in west part is with Kaibab Formation, a sharp change from cherty limestone to gray sandstone and mudstone interbedded with chert pebble conglomerate (Moenkopi), or in the Orange Cliffs area with White Rim Sandstone, a quartz sandstone. Contact with underlying Hoskinnini Formation in east part of area is a change from red-brown, poorly sorted sandstone and siltstone (Hoskinnini) with red-brown micaceous sandstone and siltstone (Moenkopi). Lower contact is erosional. Cross sections; measured sections; areal extent map.

Summary of Citation: Moenkopi

Publication:
Welsh, J.E., Stokes, W.L. and Wardlaw, B.R., 1979, Regional
   stratigraphic relationships of the Permian "Kaibab" or Black
   Box Dolomite of the Emery high, central Utah, IN Baars, D.L.,
   ed., Permianland: Four Corners Geological Society Field
   Conference Guidebook, 9th Field Conference, Moab, UT, September
   27-30, 1979, p. 143-149

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Paradox basin

Summary:
Lower contact revised in that the Triassic Black Dragon Member of Moenkopi Formation unconformably overlies the newly named Black Box Dolomite in the Capitol Reef and San Rafael areas, Emery Co, UT in the Paradox basin. Cross sections. The rocks assigned to the Black Box in this report were assigned to Kaibab Limestone in earlier reports. However, they are removed from the Kaibab because they do not resemble Kaibab of the Grand Canyon, AZ.

Summary of Citation: Moenkopi

Publication:
Kietzke, K.K., 1988, Calcareous microfossils from the Moenkopi
   Formation (Triassic, Scythian or Anisian) of central New
   Mexico, IN Anderson, O.J., and others, eds., Southeastern
   Colorado Plateau: New Mexico Geological Society Guidebook,
   no. 40, p. 181-184

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Age modified Biostratigraphic dating	San Juan basin

Summary:
Charophytes, spirorbid worms, and ostracods have been found in lacustrine and fluvial sediments of the Moenkopi Formation in Cibola Co, NM in the San Juan basin. This fauna is most abundant in the middle and upper parts of the basal lacustrine unit of the Moenkopi, a part of the Moenkopi that is equivalent to the Holbrook Member of the Moenkopi. The unit and the member are approximately equivalent to the middle Buntsandstein to lower Keuper of Europe. Information on systematic paleontology accompanied by graphic representation of two measured sections of Moenkopi at White Ridge and Mesa Gallena in Cibola Co. The Charophytes are two species of POROCHARA, one of ?ALTOCHARA. The spirobid is SPIRORBIS which resembles a species found in the Middle Triassic of Germany. The ostracods are DARWINULA (2 species), DARWINULOIDES (2 species) and GERDALIA (1 species). DARWINULOIDES is in the Lower Triassic of the Soviet Union and the Middle Triassic of Germany.

Summary of Citation: Moenkopi

Publication:
Lucas, S.G. and Hunt, A.P., 1989, Revised Triassic stratigraphy
   in the Tucumcari basin, east-central New Mexico, IN Lucas,
   S.G., and Hunt, A.P., eds., Dawn of the age of dinosaurs in
   the American southwest: New Mexico Museum of Natural History,
   p. 150-170

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Revised Areal limits	Palo Duro basin

Summary:
A unit continuous from Holbrook, AZ, Black Mesa basin across NM as far east as Fort Sumner, De Baca Co, NM, Palo Duro basin (this report). A unit formerly assigned as lower red sandstone of Santa Rosa Formation, Bernal Formation, or Anton Chico Formation revised in this report as the Anton Chico Member of the Moenkopi Formation in the Tucumcari basin; this unit can be recognized as far west as the Lucero uplift in T5N, R4W, Cibola Co, NM, San Juan basin where it grades laterally into the Holbrook and Wupatki? Members of the Moenkopi. Disconformably underlies Tecolotito Member of Santa Rosa Formation. Of Middle Triassic age in report area. Nomenclature chart.

Summary of Citation: Moenkopi

Publication:
Lucas, S.G. and Hayden, S.N., 1991, Type section of the Permian
   Bernal Formation and the Permian-Triassic boundary in
   north-central New Mexico: New Mexico Geology, v. 13, no. 1,
   p. 9-15

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	San Juan basin Las Vegas-Raton basin Palo Duro basin

Summary:
Some rocks in north-central NM have been misidentified as Bernal Formation. Rocks at Ocate and La Cueva, Mora Co., Las Vegas-Raton basin, and at Hagan-Placitas and San Ysidro-Red Mesa, Sandoval Co., San Juan basin belong to Anton Chico Member of Moenkopi rather than Bernal. Section measured in sec. 36, T14N, R15E, San Miguel Co., Palo Duro basin is 50.5 ft. of Anton Chico, disconformably above Bernal [or Artesia], disconformably beneath mottled strata of Santa Rosa Formation, consists mostly of red to brown sandstone and conglomerate. Moenkopi rocks are immature lithic quartz wackestone and lithic arenite. Many of the larger siltstone and limestone clasts were derived from the underlying Permian. Is separable from Permian by its coarser grain size, trough cross-bedded sandstone and conglomerate deposited in a low- to medium-energy fluvial environment in braided to slightly meandering streams during Middle Triassic, Anisian time. Term Bernal abandoned at other localities; name replaced by Artesia Formation.

Summary of Citation: Moenkopi

Publication:
Lucas, S.G., 1991, Triassic stratigraphy, paleontology and
   correlation, south-central New Mexico, IN Geology of the
   Sierra Blanca, Sacramento and Capitan Ranges, New Mexico:
   New Mexico Geological Society Guidebook, no. 42, p. 243-253

Usage in Publication:
Moenkopi Formation

Modifications:	Geologic Province:	Dominant Lithology:
Overview	San Juan basin Orogrande basin

Summary:
Anton Chico Member of Moenkopi Formation recognized in south-central NM where it disconformably overlies Permian rocks of the San Andres or Artesia Formations. A 1.) "paleo-weathering profile", the mottled strata, or 2.) a nonweathered Moenkopi underlies rocks of the Chinle Group, or locally of the Dakota Group. Shown on correlation diagram as underlying the Shinarump Formation (of Chinle Group) in west-central and part of east-central NM, and as underlying the Santa Rosa Formation (of Chinle Group) in parts of south-central and east-central NM. Is as much as 102 ft thick. Gray-red sandstone is the dominant lithology in this area. Most of the sandstones are very fine to fine grained, micaceous, trough cross-bedded or ripple laminated litharenites; a few are graywackes. Contains mostly fresh biotite implying a nearby volcanic source. Dips of crossbeds imply paleoflow to north and northwest. The mudstones and siltstones are gray-red. The conglomerates have intrabasinal pebbles of siltstone, mudstone, and nodular calcrete. Readily distinguished from underlying Permian red beds. Moenkopi red beds are grayish-red, devoid of gypsum, dominated by micaceous litharenites and graywackes, and have intraformational conglomerates. Permian Artesia red beds are red-brown, gypsiferous, dominated by quartzose sandstones and siltstones that are rarely trough cross-bedded massive, and laminar. Anton Chico identified in Carrizo Arroyo, Valencia Co., in Socorro and Lincoln Co., NM in the San Juan and Orogrande basins. Of Anisian, Middle Triassic age. Cross section.

Summary of Citation: Moenkopi

Publication:
Sprinkel, D.A., 1994, Stratigraphic and time-stratigraphic cross
   sections; a north-south transect from near the Uinta Mountain
   axis across the Basin and Range transition zone to the western
   margin of the San Rafael Swell, Utah: U.S. Geological Survey
   Miscellaneous Investigations Series Map, I-2184-D, 31 p., 2
   sheets

Usage in Publication:
Moenkopi Formation*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Wasatch uplift Great Basin province Paradox basin

Summary:
Occurs in southern half of study area of central UT which includes Utah and Sanpete Cos, (Wasatch uplift), Juab Co (Great Basin province), and Emery Co (Paradox basin). Laterally grades northward into Woodside Shale, Thaynes Formation, and possibly lower part of Ankareh Formation. In southwestern part of study area (southern Utah, Sanpete, and Juab Cos), Moenkopi divided into (ascending): Black Dragon and Sinbad Limestone Members, middle red member, Shnabkaib Member, and upper red member. In southernmost part of study area (part of Sanpete and Emery Cos), Moenkopi divided into (ascending): Black Dragon, Sinbad Limestone, Torrey, and Moody Canyon Members. Unconformably overlies Black Box Dolomite; unconformably underlies Moss Back Member of Chinle Formation. Early and Middle? Triassic age.

Summary of Citation: Moenkopi

Publication:
Hintze, L.F. and Axen, G.J., 1995, Geologic map of the Scarecrow
   Peak Quadrangle, Washington County, Utah and Lincoln Co,
   Nevada: U.S. Geological Survey Geologic Quadrangle Map,
   GQ-1759, 1 sheet, scale 1:24,000

Usage in Publication:
Moenkopi Formation*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Great Basin province

Summary:
Members mapped in northeast part of quad (Washington Co, UT) and northwest, western edge and central part of southwest quarter of quad (Lincoln Co, NV), Great Basin province. Consists of (ascending) Rock Canyon Conglomerate Member, lower red member, Virgin Limestone Member, Shnabkaib Member, and upper red member. Unconformably overlies Kaibab Formation; older than Chinle Formation. Better exposed in adjacent Dodge Spring quad (Anderson and Hintze, 1992, USGS GQ-1721). Upper red member assigned Early and Middle? Triassic age; other members assigned Early Triassic age.

Summary of Citation: Moenkopi

Publication:
Huntoon, J.E., Dubiel, R.F. and Stanesco, J.A., in press, Tectonic
   influence on development of the Permian-Triassic unconformity
   and basal Triassic strata, Paradox basin, southeastern Utah
   [IN Mesozoic of the Western Interior volume]: Society of
   Economic Paleontologists and Mineralogists, Rocky Mountain
   Section, __, Also, 1994, Geological Society of America
   Abstracts with Programs, v. 26, no. 6, p. 19.

Usage in Publication:
Moenkopi Formation*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Paradox basin

Summary:
Study area includes Glen Canyon National Recreation Area, Canyonlands National Park, and White Canyon of southeast UT, Paradox basin. Lowermost part of Black Dragon Member, basal member of Moenkopi in western part of study area, is a chert-pebble conglomerate that fills paleochannels cut into top of Lower Permian Kaibab Limestone and White Rim Sandstone. Conglomerate marks Permian-Triassic boundary. Basal conglomerate is traceable over much of south-central and southeast UT. In White Canyon, chert-pebble conglomerate interfingers with and is a lateral equivalent to Hoskinnini Member of Moenkopi which is lowermost Moenkopi in eastern part of study area (schematic cross section, fig 2). Lower part of Black Dragon-Hoskinnini interfingering occurs from west of Canyonlands National Park southward through Indian Head Pass and Happy Jack Mine (fig.1). Measured sections.