Stratigraphy of Triassic and associated formations in part of the Colorado Plateau region

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  • Geology, Stratigraphic -- Triassic.,
  • Geology -- Colorado Plateau.,
  • Uranium ores -- Colorado Plateau.,
  • Rocks, Sedimentary -- Colorado Plateau.,
  • Ore deposits -- Colorado Plateau.,
  • Petrology -- Colorado Plateau.,
  • Formations (Geology) -- Colorado Plateau.,
  • Chinle Formation.

Edition Notes

Book details

Statementby John H. Stewart ... [et al.] ; with a section on sedimentary petrology by Robert A. Cadigan.
SeriesContributions to the geology of uranium, Geological Survey bulletin -- 1046-Q
ContributionsStewart, John Harris, 1928-, Cadigan, Robert Allen, 1918-, U.S. Atomic Energy Commission.
The Physical Object
Paginationvi, 487-576 p. :
Number of Pages576
ID Numbers
Open LibraryOL22973197M

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Additional Physical Format: Online version: Stewart, J.H., Stratigraphy of Triassic and associated formations in part of the Colorado Plateau region. STRATIGRAPHY OF TRIASSIC AND ASSOCIATED FORMATIONS IN PART OF THE COLORADO PLATEAU REGION, Geological Survey Bulletin Q [John H.

Stewart] on *FREE* shipping on qualifying offers. STRATIGRAPHY OF TRIASSIC AND ASSOCIATED FORMATIONS IN PART OF THE COLORADO PLATEAU REGION, Geological Survey Bulletin QAuthor: John H. Stewart. Stratigraphy of Triassic and Associated Formations in Part of the Colorado Plateau Region By JOHN H.


Stewart, George A. Williams, Howard F. Albee, and Omer B. Raup; with a section on SEDIMENTARY PETROLOGY by Robert A. Cadigan June Trace Elements Investigations Report This preliminary report is distributed without editorial and technical Cited by: Report discussing stratigraphic studies of the Triassic and associated formations in northern Arizona and southern Utah.

The programs of study included are "(1) regional stratigraphic descriptions and correlation of units, (2) sedimentary structure studies, (3) pebble studies, and (4) sedimentary petrology."Author: G.A.

Williams, R.A. Cadigan, H.F. Albee, John H. Stewart. The rocks of the Colorado Plateau represent a diversity of environmental conditions over hundreds of millions of years.

These rocks are well exposed in the many canyons that occur across this region, most spectacularly in the Grand Canyon in northern Arizona (Figure ).The oldest fossils known from the Colorado Plateau region are stromatolites —layered domes of carbonate sediment formed by.

2 Stratigraphy 44 eg i i i ui Figure 1. Index map and overviews of exposures of Moenkopi Formation strata in the study area. Index map of Utah and Colorado, black box shows area depicted.

Exposures of Mesozoic strata on the Colorado Plateau are an invaluable archive of information bearing on the geotectonic and paleogeographic evolution of interior North America (Dickinson and Gehrels, a).Although lateral equivalents of plateau Mesozoic formations extend through the central Rocky Mountains to the east and northeast, across the High Plains as far as the Llano Estacado to the.

The Colorado Plateau extends partly into northwestern New Mexico. The San Juan River is the main river drainage in the region. The San Juan Basin is a structural basin that encompasses most of the New Mexico portion of the Colorado Plateau (see Figure ).

The region around Farmington, New Mexico is an old oil and gas producing basin. At least as viewed from the Colorado Plateau, sedimentation took place in stable and simple tectonic setting, a tectonic lull between more complex settings.

Eastern Cordilleran Basin. West of the Colorado Plateau, Lower and Middle Triassic deposits thicken dramatically across the Wasatch line (Paull and Paull,Blakey et al., ). Stratigraphy of Triassic and associated formations in part of the Colorado Plateau region, with a section on sedimentary petrology Bulletin Q.

Stratigraphy and origin of the Chinle formation and related Upper Triassic strata in the Colorado Plateau region. --Introduction --Methods of study and scope of report --Field and office work --Key to numbered localities --The Colorado Plateau region part of Chinle Formation --Mottled strata --Shinarump and related.

A trend of Late Triassic aridification similar to that of the Colorado Plateau is indicated by facies changes, evaporite occurrences, and paleosols in the Upper Triassic to Lower Jurassic formations of the Newark Supergroup (Olsen, ; Kent and Olsen, ).

Abdel-Gawad, A. M., and Kerr, P. F.,Alteration of Chinle siltstone and uranium emplacement, Arizona and Utah: Geol. Soc. America Bull., v.

74, no. 1, p. Denver, Colorado INTRODUCTION The stratigraphic nomenclature applied in various parts of west-ern Colorado, northwestern New Mexico, and a small part of east- central Utah is summarized in the accompanying chart (fig.

The locations of the areas. Colorado Plateau are Cretaceous in age. This tells us that at this time the plateau was at sea level. The Laramide Orogeny occurred from the end of the Cretaceous to Early Tertiary periods and was responsible for formation of the Rocky Mountains.

Deformation was more gentle on the Colorado Plateau, resulting in the formation. Instead, in the Late Triassic-age Chinle Formation, we find footprints of dinosaurs and fossils of giant, fish-eating amphibians and crocodile-like animals that lived here when western Colorado was close to the equator and the region was covered by rivers, lakes and forests.

The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United province covers an area ofkm 2 (, mi 2) within western Colorado, northwestern New Mexico, southern and eastern Utah, northern Arizona, and a tiny fraction in the.

Formation and related Triassic strata in the Colorado Plateau region with a section on sedimentary petrology by R. Cadigan and on conglomerate studies by W. The Moenkopi Formation is a geological formation that is spread across the U.S. states of New Mexico, northern Arizona, Nevada, southeastern California, eastern Utah and western unit is considered to be a group in Arizona.

Part of the Colorado Plateau and Basin and Range, this red sandstone was laid down in the Lower Triassic and possibly part of the Middle Triassic, around   The guidebook covers the geology of the Chuska Mountains region of the central Colorado Plateau, which crosses several major monoclines from the San Juan Basin on the east to the Deviance Plateau on the west.

The book focuses on the stratigraphy exposed by the Laramide uplift and subsequent erosion, and on the mid-Tertiary Navajo Volcanic Field. Stratigraphic studies of the Triassic and associated formations were made in southeastern Utah and adjoining parts of Colorado and Arizona.

Five principal lines of investigation were followed: regional stratigraphv, sedimentary petrology, pebble studies, sedimentary. The Upper Jurassic Morrison Formation clearly defines the beginning of the dominance of westerly derived coarse-grained detritus onto the Colorado Plateau–Southern Rocky Mountain region.

The Morrison has been interpreted as a foreland basin deposit to backbulge deposit (DeCelles and Currie, ) associated with Sevier thrusting in the. The area then rose several thousand feet, along with the rest of the Colorado Plateau, during the Neogene period.

This uplift was caused by epeirogenic forces, which differ from orogenic forces in that they are gradual and occur over broad regions of land. Folding and deformation are not normally associated with an epeirogeny. Reynolds et al. () correlated it with the Triassic Moenkopi Formation of the Colorado Plateau and elsewhere in the western United States, which contains similar (though unmetamorphosed) lithology and unconformably overlies the Permian Kaibab Limestone (Salem, ).

Marine limestones become prominent until they form a major part of the formation along the western margin of the Colorado Plateau Still farther west and northwest, the Moenkopi grades into a totally marine sections known as the Thaynes Limestone, which contains ammonitic cephalopods of Lower Triassic age" (p.

Stratigraphy and origin of the Triassic Moenkopi Formation and related strata in the Colorado Plateau region, United State Geological Survey, Professional Paper number [Stewart, J. & F. Poole & R. Wilson] on *FREE* shipping on qualifying offers. Stratigraphy and origin of the Triassic Moenkopi Formation and related strata in the Colorado Plateau region.

Pertains to the uranium rush on the Colorado Plateau. From Denny W. Viles and other sources. Clippings files, were maintained by Denny Viles, Vice President of the Vanadium Corporation of America.

Mining Year Book, by the Colorado Mining Assoc. and All Western Stratigraphy of Triassic and Associated Formations in Part of the. An occurrence of reptile subaqueous traces in the Moenkopi Formation (Triassic) of Capitol Reef National Park, South Central Utah, USA.

Journal of Pennsylvania Academy of Science, 71, Suppl. And Index McKee, E.D., Stratigraphy and History of the Moenkopi Formation of Triassic Age: The Geologic Society of America Memoir The Wingate Sandstone is a geologic formation in the Glen Canyon Group of the Colorado Plateau province of the United States which crops out in northern Arizona, northwest Colorado, Nevada, and Utah.

Wikimedia Commons has media related to Wingate Sandstone. Direction of sediment transport in the Triassic and associated formations of the Colorado Plateau by Forrest G Poole.

The mean age of samples from ores in the Jurassic Morrison and Entrada formations and the Triassic Shinarump conglomerate 50, and 73 million years, respectively. in part, may be viewed as a competition. Stratigraphy and origin of the Chinle Formation and related Upper Triassic strata in the Colorado Plateau region.

U.S. Geological Survey, Professional Paperp. Stock, C. the Triassic rocks to the Chinle Formation of Gregory (). They named two new stratigraphic units for strata below Huene’s () Poleo, the “Agua Zarca sandstone member” and “Sali-tral shale tongue” of the Chinle Formation.

They referred to the stratigraphic unit named by Huene () as the “Poleo sand-stone lentil” of the. Triassic Popo Agie or Chinle Formation. The nature of the contact between these two formations is unclear both in stratigraphic location and conformability.

The Chinle Formation consists, in ascending order, of the Gartra Member, the purple unit, the ocher unit, and the upper red unit.

The overlying Nugget Sandstone consists of two members. the Colorado Plateau associated with Laramide deformation and Cenozoic opening of the Rio Grande Rift. This estimate of Colorado Plateau rotation is consistent with a systematic discrepancy between plateau and cratonic poles for the Early Triassic, whereas available late Paleozoic and Jurassic poles are.

The Colorado Plateau is an arid region that developed as a stable crustal block. It was not significantly affected by either the compressional forces that gave rise to the Rockies or by the Cenozoic extensional forces that produced the Basin and Range.

Between eight and five million years ago, an epeirogenic (vertical) uplift raised the entire region as a single block to its present elevation. Stratigraphy of Triassic and associated formations in part of the Colorado Plateau region: USGS Bulletin Q,90 pp. plus plate in pocket. Very good condition.

Criteria for outlining areas favorable for uranium deposits in parts of Colorado and Utah: USGS Bulletin J,18 pp. plus geologic map in pocket. Very good Rating: % positive.

More than m of Triassic strata are exposed just N of Currie, Nevada in secs. T29N, R64E. The Thaynes Formation is m of limestone, calcareous shale and siltstone that rest disconformably on the Permian Gerster Formation.

A m-thick interval of ammonite packstones is m above the base of the Thaynes in the NW1/4NW1/SW1/4 sec. Stratigraphic and lithologic studies of the Colorado Plateau, L. Craig in charge. A summary report on the stratigraphy and lithology of the Morrison and associated formations is nearing completion.

Lithologic studies of Cre­ taceous and Tertiary formations, including some field reconnaissance and sampling, will be continued. Dubiel, Russell F., Summary of Geology and coal Resources of the Blackhawk Formation in the Southern Wasatch Plateau, Central Utah U.S.

Geological Survey Professional Paper –B, Assessment, Chapter K of Geologic Assessment of coal in the Colorado Plateau: Arizona, Colorado, New Mexico, and Utah Edited by M.A. Gary J., Hampson, John A. Howell, and Stephen S.

Flint. This suggests the Triassic-Jurassic boundary on the Colorado Plateau is relatively transitional-not a profound unconformity-within the Wingate-Moenave lithosome. 81 INTRODUCTION Upper Triassic strata exposed in the Four Comers region of Arizona, Utah, Colorado and New Mexico (Fig.

1) belong to the Chinle Group of.Triassic and Jurassic rocks on the Colorado Plateau not only reflect the depositional and tectonic history of the Colorado Plateau region, they also yield clues about growing tectonic unrest to the west and south of the region.

The sediment record of the Nevadan and early Sevier orogenies is reflected in these rocks. INTRODUCTION.Click on the book chapter title to read more.

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