... deposition of the basal Shinarump and Mesa Redondo members, herein collectively called the Shinarump conglomerate, began in Late Triassic time, yet the earliest known arc magmatism is older by as much as 40 m.y. Analysis of detrital zircons from eight sites in southeastern Nevada, southern Utah...

...Figure 6. Summary correlation diagram of the Chinle Formation (shaded) and dinosaur-bearing formations of northwestern Argentina from (A) this study and (B) reproduced from Brusatte et al. (2010) and Langer et al. (2010) . Hett.—Hettangian, MR—Mesa Redondo Member, NA—North America, OR—Owl Rock...

... (from oldest to youngest): the Shinarump Conglomerate and Mesa Redondo Member, Blue Mesa Member, Sonsela Member, Petrified Forest Member, and Owl Rock Member ( Parker, 2006 ; Woody, 2006 ; Martz and Parker, 2010 ). Following the description by Martz et al. (2012) , all five...

... Forest National Park study area, the “long Norian” Stage ( Muttoni et al., 2004 ) of the Chinle Foramtion is represented by the Mesa Redondo, Blue Mesa, Sonsela, and Petrified Forest Members. The Owl Rock Member is part of the Rhaetian Stage ( Dubiel, 1994 ; Tanner, 2003 ; Martz and Parker, 2010...

..., extensive radioisotope geochronology within the Chinle Formation has made these strata the standard by which the Late Triassic of the western USA can be relatively dated ( Fig. 8 ). Most relevant to the Popo Agie is the establishment of precise U 238 /Pb 206 radioisotopic ages from the Mesa Redondo Member...

...Figure 8. Normalized distribution of Permian–Triassic zircon grains in the Buckskin Formation, Chinle Formation, Waterman formation, and Shinarump Conglomerate (“Chinle Fm” indicates beds exclusive of Shinarump Conglomerate and Mesa Redondo Member). Permian–Triassic data from the Cordilleran arc...

... previously been referred to the Santa Rosa sandstone and the Chinle formation though Dobrovolny and Summerson (1946) named a distinct sequence of beds at the top of the Chinle formation, the Redonda member of the Chinle formation. The name was taken from Redonda (also spelled Redondo) Mesa, a large mesa...

... and lower Sonsela deposits is decreased dip of the subducting slab (pictured left); however, several other possibilities exist to explain this change (see text). (C) Mudstone-dominated units of the Mesa Redondo and Blue Mesa Members reflect a return to an aggradational regime, likely the result of a phase...

...Fig 3.— Selected outcrop photographs of representative paleosols and outcrop stratal successions. The rock hammer in Parts A–G is approximately 28 cm long. A, B) Drainage Index 1 poorly drained paleosols: A) MR46 (FAC 3) of the Mesa Redondo Member with gley matrix colors (10Y) and slickensides...

..., the Cat Mesa fault zone in the southwestern Jemez Mountains ( Fig. 3 ) offsets Permian Yeso Formation down to the east ∼240 m; but ca. 9 Ma Keres Group andesite is offset <10 m, and 1.25 Ma Tshirege Member of the Bandelier Tuff is displaced <2 m ( Kelley et al., 2003 , 2007b ). Thus, the Cat Mesa...

..., in ascending stratigraphic order, the Mesa Redondo, Blue Mesa, Sonsela, Petrified Forest, and Owl Rock members within the ∼280-m-thick section exposed in PEFO and the surrounding area ( Fig. 2 ; Ash and Creber, 1992 ; Woody, 2006 ; Martz and Parker, 2010a ). FIGURE 2— Generalized stratigraphic...

...., sd., and cgl. Pal eocene Salina fm. Lower Upper Negritos fm. Balcones shale (Danian) Eocene Lower Negritos shale Mesa sands Not known Petacas shale, Ancha cgl. Upper Cretaceous   * The double usage of middle and upper Oligocene is due to the miscorrelation of the Mirador...

..., 2010 ; Dubiel and Hasiotis, 2011 ; Atchley et al., 2013 ; Trendell et al., 2013a , 2013b ). The Chinle Formation at the Petrified Forest National Park can be divided into five members. The Shinarump/Mesa Redondo Member ( Fig. 2 ) represents the basal deposit overlying the Early to Middle...

... United States ( Figure 1 ). Outcrops within the PEFO in northeastern Arizona include the upper Carnian Mesa Redondo Member through the Rhaetian Rock Point formation ( Parker, 2006 ; Woody, 2006 ; Martz and Parker, 2010 ) ( Figure 2 ). This study focuses on the lower part of the Norian Sonsela member...

... section is composed of three groups lithologically similar, each consisting of a thick shale section with sand or conglomerate at the base. The oldest of these three, the Redondo group, is Senonian in age and is separated from the Muerto limestone by a major unconformity. It crops out extensively...

... for the Chinle Formation in Petrified Forest National Park follows Woody (2006) and Martz and Parker (2010) . Exposed strata are assigned to five members; from oldest to youngest, these are the Mesa Redondo, Blue Mesa, Sonsela, Petrified Forest (previously the upper Petrified Forest), and Owl Rock Members...