...HENRY S JOHNSON, JR. Abstract Abdel-Gawad and Kerr (1963) conclude that mottled alteration of basal Chinle beds on the Colorado Plateau was caused by hydrothermal solutions that also introduced hypogene uranium minerals into Triassic and Jurassic strata. In contrast, the author of this discussion...

...PAUL F KERR; A. M ABDEL-GAWAD Abstract The so called “pinto” effect of Chinle strata in Arizona and Utah is believed to be: (1) caused by local lateral movement of solutions, (2) unrelated to a simple lateritic profile, (3) dependent on a sequence of geologic events rather than geometry of position...

...A. M ABDEL-GAWAD; PAUL F KERR Abstract On the Colorado Plateau, at the base of the Chinle Formation, siltstone silicification, bleaching, argillic alteration, and carbonatization are associated with uranium mineralization, as noted in three areas. (1) Near Cameron, Arizona, a silicified zone...

... were identified regionally in the Popo Agie Formation, Wyoming; Stanaker Formation, Wasatch/Idaho; upper Ankareh, western Uinta; and the mottled “member” and ochre siltstone “member” of the Chinle Formation, eastern Uinta (for discussion, see Reeside et al., 1957 ; Dubiel, 1994 ). Sample “GS...

..., leading to the hypothesis that they are temporally related and were derived from similar sources. Volcaniclastic sandstone from the lowest Vampire Formation in eastern California, the Sonsela Member of the Chinle Formation at Petrified Forest National Park, northeastern Arizona, and the herein-named...

...N.R. Riggs; Z.A. Oberling; E.R. Howell; W.G. Parker; A.P. Barth; M.R. Cecil; J.W. Martz Abstract The Upper Triassic Chinle Formation in southwestern Laurentia is the oldest distinctive record of Early Mesozoic Cordilleran arc magmatism, in the form of detrital zircons and volcanic clasts. Initial...

... geochronological ages that proliferate through the geologic record to present day. The characteristic detrital zircon (DZ) U-Pb ages for this Appalachian-Ouachita Cordillera primarily consist of a 500–275 Ma DZ U-Pb age distribution associated with Paleozoic Appalachian-Ouachita volcanism and igneous emplacement...

... created a modern caprock of mostly gypsum and anhydrite, which forms due to the dissolution of salt. The Paradox Formation is overlain by the upper Pennsylvanian Honaker Trail Formation ( Fig. 3 ), a succession of limestones, sandstones, shales, and siltstones of mixed fluvial and shallow-marine affinity...

...Evan R. Howell; Ronald C. Blakey Abstract The Sonsela Member of the Upper Triassic Chinle Formation in Petrified Forest National Park, Arizona, forms a distinctive part of an extensive fluviolacustrine complex that blanketed the Colorado Plateau region and surrounding areas. Upper Triassic...

... paleosurface ( Billingsley et al., 2012 ). CBTP volcanic complex wall rock comprises Bidahochi Formation (poorly consolidated mudstone) and competent Moenave Formation (cross-bedded sandstone and siltstone). Tbl—Bidahochi Formation; Jm—Moenave Formation; T R co—Chinle Formation, Owl Rock Member; T R cp—Chinle...

... in pervasively cross-stratified fluvial sandstone beds as opposed to massive mudstones or siltstones typical of most previous reports. This occurrence affords a uniquely informative view of lungfish bioturbation and expands the morphological inventory of lungfish burrows documented in the rock record...

...Theresa M. Schwartz; Sandra J. Wyld; Joseph P. Colgan; Douglas W. Prihar Abstract Fluvial strata of the Upper Triassic Chinle Formation and Dockum Group, exposed across the Western Interior of North America, have long been interpreted to record a transcontinental river system that connected...

...) Vertical rhizocretions (R), densely packed glaebules (G), and sub-horizontal skew planes (S) in a mature aridosol. (D) Calcretized cylindrical vertebrate burrow cast in a mature aridosol formed in pale red loessic siltstone FIGURE 9 —Pedogenic features of three successive stages in the maturation...

... rocks of the overlying Permian. The lower part of the Supai is considered to be of Pennsylvanian age and the upper part is Permian ( Huddle and Dobrovolny, 1945 ). The Supai Formation is a 1,100-ft sequence of interbedded, varicolored shale, red to brown siltstone, and varicolored limestone. Fig. 6...

... Formation (Chhoti Khatu) and emplacement of last stage Malani dykes suggest that the last phase of Malani magmatism generated heat for the partial melting of banded gneissic complex-II (Sirohi Group). The occurrence of vanadium in sandstone–gritty sandstone–conglomerate from Sonia Formation of Marwar...

... and Jurassic rocks include sandstone and shale of continental deposition. The Dakota and Burro Canyon generally are regarded as continental deposits of conglomerate, sandstone, and siltstone. The Mancos Shale is marine. The aggregate thickness of the Mesozoic sequence, from the Chinle through the Entrada...

... . 11 9 2009 12 1 2010 21 1 2010 The succession at Sierra de Catorce ( Figs. 1 and 3C ) consists of finely laminated shale and intercalated thin siltstone and sandstone layers ( Fig. 5F ). The main exposures in this area occur along the General and Ojo de Agua Canyons...

... shadow in the lee of rising Cordilleran highlands, or both effects. The eolian Wingate Sandstone is underlain by a red-bed interval, dominantly siltstone, that was named the Rock Point Member of the Wingate Formation in Arizona ( Harshbarger et al., 1957 ) and the Church Rock Member of the Chinle...

... by Carter and Gualtieri (1957) . Thin veinlets of hydrocarbon are also commonly observed in siltstones from the Chinle Formation along the Cashin fault. One location near the Cashin fault displays black bands of pore-filling hydrocarbon residue that have been replaced by Cu-sulfide minerals. More...

... and they did not comment on the extent of the fault at depth. It has been argued that the Lisbon Valley fault plane was a vehicle for the emplacement of the rich uranium deposits associated with the Triassic Chinle formation on the Lisbon Valley anticline. If extensive uranium mineralization had moved up...