The Horizon of the Marine Jurassic of Utah

Dake, C. L.

doi:10.1086/622685

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…Evidence of an erosional unconformity between the Moenkopi formation of Triassic age and the underlying Kaibab limestone of Permian age occurS in many places in northern Arizona and southern lTtah (McKee, 1938, p. 57-58;Gilluly, 1929, p. 81-82;Gilluly and Reeside, 1928, p. 64-65 ;Gregory and Moore, 1931, p. 45-46;Dake, 1920). Similar evidence is in the Capitol Reef area.…”

Section: Kaibab Limestonementioning

confidence: 87%

“…Gregory and Moore (1931) examined the geology of the area in connection with their work in the Kaiparowits region to the south. Dake ( 1919Dake ( , 1920 outlined the stratigraphic sequence in the area and related it to the rest of the Colorado Plateau. The northeastern part of plate 1 covers the southern part of the San Rafael Swell area mapped by Gilluly (1929).…”

Section: Previous Workmentioning

confidence: 99%

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Geology of the Capitol Reef area, Wayne and Garfield Counties, Utah

Smith¹,

Huff²,

Hinrichs³

et al. 1963

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Section: Kaibab Limestonementioning

confidence: 87%

Section: Previous Workmentioning

confidence: 99%

Geology of the Capitol Reef area, Wayne and Garfield Counties, Utah

Smith¹,

Huff²,

Hinrichs³

et al. 1963

Professional Paper

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“…The first descriptions of the Entrada Sandstone were made by scientists in the early 20 th century as part of geologic surveys of western Colorado and eastern Utah (Cross, 1907;Lupton, 1916;Emery, 1918;Dake, 1919;Longwell et al, 1923). Gilluly and Reeside (1928) were the first to differentiate the Entrada Sandstone as a distinct formation, naming it after the prominent Entrada Point located in the northern San Rafael Swell.…”

Section: Previous Workmentioning

confidence: 99%

Redbeds of the Upper Entrada Sandstone, Central Utah: Facies Analysis and Regional Implications of Interfingered Sabkha and Fluvial Terminal Splay Sediments

Valenza¹

2016

Geological Society of America Abstracts With Programs

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First distinguished from other sedimentary successions in 1928, the Entrada Sandstone has been the subject of numerous studies. The western extent of the formation was initially described as laterally continuous "earthy" red beds, and categorized as sub-to supratidal marineinfluenced sediments. Recent workers have reexamined the sedimentary facies hosted by the Entrada Sandstone, and findings suggest purely terrestrial depositional environments. Several outcrops of the upper Entrada hosted peculiar sedimentary features, including undulatory and convex-upward, parallel-laminated bedforms, reminiscent of hummocky cross-stratificationunexpected features in a terrestrial environment. The purpose of this study was to collect detailed outcrop measurements of these and other facies present in the upper Entrada Sandstone and to place them in context within a regional sedimentary system. Measured section data was analyzed and divided into sixteen primary facies based on textures, features, bedforms, grain size, and other characteristics. Surfaces were also noted and described. Each facies and surface was recognized to have developed under specific depositional or flow conditions, including eolian, paleosol, and fluvial subcritical, critical, supercritical, and waning flow. Primary facies were grouped into observed and interpreted facies associations. A depositional environment was then assigned to each facies association. These environments included sabkha, overbank splay/paleosol, distal terminal splay, and hyper-distal terminal splay. Ancient analogs were found in the Blomidon, Skagerrak, and Ormskirk Formations, which have been described as dryland fluvial systems that terminated onto saline mudflats (sabkhas). Modern analogs were found in the central Australian continent, in the form of fluvial terminal splays in ephemeral Lakes Eyre and Frome. The sedimentary system of the upper Entrada Sandstone of the San Rafael Swell is interpreted as an interfingering fluvial terminal splay and inland sabkha system. These are marked by a wide array of sedimentary structures representing stark extremes, from hyperarid to flash flooding conditions. During arid conditions, the only source of water was evaporative pumping of a high water table. During the rare occasions when surface water flowed through the system, flash flooding events produced the highest stage of supercritical flow described in geological literature. The succession of these facies reveals allogenic and autogenic processes active at the time of deposition, including episodes of tectonic uplift and fluvial avulsions.

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“…yer part of an assemblage of beds which includes gypsum, sandstone, consolidated variegated muds, and lenses of conglomerate," and extends upward to "coal bearing fossiliferous Cretaceous." Other geologic studies (Gilluly and Reeside 1928, Dake 1919 showed that the "Jurassic" rocks noted by Howell, Gilbert, Dutton, and vValcott in the Parunuweap, Kanab, and Paria Valleys are widely exposed in east-central and southern Utah, where they comprise groups of strata strongly contrasted in composition and origin and are represented in the topography of distinctive forms. As these groups maintain their characteristic features over hundreds of square miles, names applied in local descriptions were gradually abandoned in favor of a comprehensive terminology; by agreement among field workers the Jurassic beds above the Navajo sandstone were subdivided into fiye formations-Carmel (at the base), Entrada, Curtis, Summerville, and Morrison.…”

Section: Jurassic Formations Previous Studiesmentioning

confidence: 99%

The geology and geography of the Paunsaugunt region, Utah

Gregory¹

1951

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Page 42 19. Diagrams showing features of the Cretaceous and Tertiary formations at their contact_______________________ 44 20. Basal conglomerate of the Wasatch formation in contact with sandstone of the Kaiparowits formation_________ 45 21. Characteristic erosion features in the massive limestone along the Tropic traiL_____________________________ 47 22. White upper conglomeratic part of the Wasatch formation in Castle Wash_________________________________ 48 23. Conglomerate interbedded with pink limestone, Red Canyon_____________________________________________ 48 24. Wasatch formation (cliffs) overlying the Kaiparowits formation (slope)____________________________________ 49 25.

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The Horizon of the Marine Jurassic of Utah

Abstract: FIG. I.-Contact of thin-bedded marine Jurassic limestone on white cross-bedded sandstone of La Plata group. One-half mile southwest of Teasdale, Utah. (Contact at black line.

Cited by 4 publications

References 2 publications

Geology of the Capitol Reef area, Wayne and Garfield Counties, Utah

Geology of the Capitol Reef area, Wayne and Garfield Counties, Utah

Redbeds of the Upper Entrada Sandstone, Central Utah: Facies Analysis and Regional Implications of Interfingered Sabkha and Fluvial Terminal Splay Sediments

The geology and geography of the Paunsaugunt region, Utah

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