The Pre-Moenkopi (Pre-Permian?) Unconformity of the Colorado Plateau

Dake, C. L.

doi:10.1086/622696

Cited by 7 publications

(5 citation statements)

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“…This unconformity is well documented by many geologists (Howell, 1875;Gilbert, 1877;Button, 1880;and Gregory, 1917). Dake (1920) probably was the first to report the widespread extent and characteristics of the unconformity. During the long period of erosion, represented by the unconformity, the Kaibab limestone was completely removed from much of this area, and the Moenkopi formation rests directly upon the Coconino sandstone.…”

Section: Triassic Rocksmentioning

confidence: 63%

Water in the Coconino sandstone for the Snowflake-Hay Hollow area, Navajo County, Arizona

Johnson¹

1962

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Section: Triassic Rocksmentioning

confidence: 63%

Water in the Coconino sandstone for the Snowflake-Hay Hollow area, Navajo County, Arizona

Johnson¹

1962

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“…The top of the Kaibab Limestone, which forms the rim of Grand Canyon, is in the approximate position of the Permian-Triassic unconformity, although in only a few places on the rim do overlying Triassic rocks remain to preserve the ancient erosion surface. This unconformity has been the subject of many detailed studies: Dake (1920); Longwell (1925); Baker, Dobbin, McKnight,. and Reeside ( 1927) ;and McKee ( 1938, p. 55-:-61;).…”

Section: Significance Of Unconformitiesmentioning

confidence: 99%

The Colorado River region and John Wesley Powell

Rabbitt¹,

McKee²,

Hunt³

et al. 1969

Professional Paper

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A century ago John Wesley Powell-teacher, scientist, and veteran of the Civil War-set out to explore the unknown reaches of the Colorado River. He emerged from the forbidding canyons with a compelling interest in the nature of the western lands and how they could be developed for the greatest benefit to the Nation. A man gifted with imagination, yet always tempered by the scientist's appreciation for facts, Powell became one of the country's most vigorous proponents for the orderly development of the public domain and the wise use of its natural resources. Throughout his lifetime, Powell stood firm in his belief that science, as a sound basis for human progress, should serve all the people, and he played an important role in organizing and directing scientific activities of the U.S.

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“…Steed's work is published in a guidebook of the geology of the High Plateaus, which contains many papers regarding the geology of the region. Reports dealing primarily with stratigraphic problems in the Circle Cliffs and surrounding areas are those by Dake (1919Dake ( , 1920, Moore (1922), Longwell, Miser, Moore, Bryan, and Paige (1923), Baker, Dane, and Eeeside (1936), McKee (1938McKee ( , 1954a, Craig and others (1955), Stewart (1957), and Stewart, Williams, Albee, and Raup (1959).…”

Section: Previous Workmentioning

confidence: 99%

Geology of the Circle Cliffs area, Garfield and Kane Counties, Utah

Davidson¹

1967

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The Circle Cliffs area is a few tens of miles west of the Henry Mountains, on the west edge of the Colorado Plateau, and is bordered to the west by the High Plateaus of southeastern Utah. The climate is arid to semiarid, and the land is used mainly for cattle grazing. Rugged canyons, mesas, benches, and hogbacks, supported and walled by massive colorful sandstone beds, characterize the topography of the area; the maximum relief is about 4,800 feet.The rocks in the central part of the area are gently to steeply folded along the northwest-trending axis of the Circle Cliffs anticline. Several thousand feet of stratified rocks were eroded from the anticlinal area during Mesozoic and late Tertiary time, and the oldest rocks now are exposed in the central Circle Cliffs area, along the axis of the anticline, and the youngest rocks on the perimeter of the area. The stratified sedimentary rocks that crop out are Paleozoic, Mesozoic, Tertiary, and Quaternary in age. Some of the Mesozoic sedimentary rocks contain concentrations of uranium minerals, and the study of these rocks and their included uranium deposits was one of the principal objectives of the investigation of the Circle Cliffs area.Sandstone and mudstone are dominant lithologies in the rock sequence that is about 8,500 feet thick. Slightly more than half of the sequence was deposited in a continental or near-shore continental environment, and the rest was deposited in a marine or littoral marine environment. The Permian rocks are sandstone and dolomite and are chiefly of marine origin. The Triassic and Jurassic rocks are sandstone to mudstone and were deposited partly in continental and partly in marine environments. The Cretaceous rocks are mudstone and sandstone deposited mainly in a marine environment. The Tertiary and Quaternary rocks range from silt to gravel and were deposited entirely in a continental environment.The sedimentary rocks are folded into an anticline, which is the major structural feature of the area. The anticline trends northwest and dips steeply to the northeast and gently to the southwest. It plunges gently northwest and southeast from the central part of the area. The vertical closure on the central part of the anticline is 1,200 feet, and total displacement of beds is about 9,000 feet. Few faults are present except on the southwest side of the anticline where a minor graben closely parallels the anticlinal axis. The dominant joint sets trend northeast and north to northwest. The anticline probably was formed in middle to late Paleocene time, but the joint systems may be as young as mid-Tertiary.The uranium deposits are small, and opportunity for discovery of any large deposits seems poor. Most deposits are in the Moenkopi Formation on 2 GEOLOGY OF THE CIRCLE CLIFFS AREA, UTAH the edges of channels filled with sandstone of the Shinarump Member of the Chinle Formation. The criteria favoring minable deposits in the Shinarump are (1) the presence of a channel, (2) the presence of material in the channel sandstone capable of precipitating ur...

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The Pre-Moenkopi (Pre-Permian?) Unconformity of the Colorado Plateau

Cited by 7 publications

References 0 publications

Water in the Coconino sandstone for the Snowflake-Hay Hollow area, Navajo County, Arizona

Water in the Coconino sandstone for the Snowflake-Hay Hollow area, Navajo County, Arizona

The Colorado River region and John Wesley Powell

Geology of the Circle Cliffs area, Garfield and Kane Counties, Utah

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