...THOMAS M. LEHMAN Abstract Fluvial flood-plain deposits of the upper Aguja, Javelina, and El Picacho Formations in Brewster and Presidio Counties of West Texas record multiple episodes of soil formation during Late Cretaceous (Maastrichtian) time. These well-differentiated alluvial paleosols...

.... The base of the formation is exposed in the eastern part of Cerro El Picacho (Fig. 1) , where it unconformably overlies the Mural Limestone and the Picacho conglomerate. It is cut by the Rancho Vaquería quartz monzonite intrusion. Two biotite 40 Ar/ 39 Ar ages of 72.1 ± 0.4 and 69.1 ± 0.4 Ma (F. Gray...

...). Originally, seven stratigraphic units were proposed for the Cretaceous rocks exposed in the Lampazos area, but in this article only five units (El Aliso, Agua Salada, Lampazos, Espinazo del Diablo, and Los Picachos formations) have been used, and we propose herein to discontinue usage of the other two (Nogal...

... range and the formation of an important back thrust at the Cinco Picachos range. Fault generation gets young to the east; the Pintascayo range uplift started at 7.6 Ma, while the Baja Orán range uplift began at about 6.9 Ma. These two ranges continued growing simultaneously until at least 4.7 Ma...

... they show the El Aliso Formation forming the Sierra Las Azules. Because of this and because in the southern part of the area, they map the Lampazos Formation instead of the Los Picachos Formation, they conclude that the Lampazos succession, south of their Rosa Maria fault, is composed only of deepwater...

... and systematics , in Carpenter , K. , and Currie , P. J. , eds., Dinosaur systematics: Approaches and perspectives : New York , Cambridge University Press , p. 211 – 229 . Lehman , T. M. , 1996 , A horned dinosaur from the El Picacho Formation of west Texas, and review of ceratopsian...

.... TECTONIC MAP OF THE REPUBLIC OF MEXICO The following shelves may be recognized: Coahuila, Tamaulipas, and Yucatan; similarly, the following massifs: El Burro-Picachos, Teziutlan, San Andres, Chiapas, the complex massif of Guerrero and Oaxaca, and the small massifs of Guerrero and Michoacan...

.... mariscalensis ( Lehman, 1989 ), recognized from the Campanian Aguja Formation of Texas ( Lehman, 1989 ), and the unnamed “El Picacho ceratopsian” from the Maastrichtian El Picacho Formation of Texas ( Lehman, 1996 ). The monospecific Pentaceratops ( Osborn, 1923 ), from the upper Campanian to lower...

... El Paso 5,400 2,700 Mina Plomosas 4,000 1,800 In the Plomosas vicinity as at El Paso both thickness and composition indicate shelf deposits. The Plomosas formation near Mina Plomosas is about 5,000 feet thick, including about 4,000 feet of Paleozoic and 1,000 feet of Jurassic rock...

... the western region of the VS area, with the central-western part having the highest concentration of volcanic structures and the most voluminous ones ( Fig. 2 ). The volcanic activity in the middle Pleistocene began with the formation of three shield volcanoes in less than 200 k.y.: El Picacho (987.1...

...B. A. Bishop Abstract The section exposed in the Sierra de Picachos is approximately 4,900 ft (1,490 m) thick and is divisible into seven formations, which range in age from Neocomian to Campanian and possibly to Maestrichtian (Early to Late Cretaceous). These formations are, from oldest...

... and the Government decided to separate Nuevo Leon from Texas because the citizens of Nuevo Leon sympathized with Texas in its revolution.   1180.3 Navarro-Taylor contact. The Taylor formation at this point has been brought up over the Salado arch. Taylor outcrop along road is 9.5 km. wide.   1170.8 Taylor...

... strata where the Alamosaurus fauna occurs (North Horn Formation of Utah, uppermost Kirtland Shale of New Mexico, and El Picacho Formation of Texas; Lehman, 1996 ). Gilmore (1946) identified ceratopsid remains from the North Horn Formation in Utah as Arrhinoceratops and referred them to a new...

... occur between outcrops of the El Gueriguito and Rancho Vaquería plutons ( Fig. 14 ), probably coincident with the thrust fault at Picacho de Arizpe that places the Bisbee Group over the Cocóspera Formation. To the northwest, this boundary may extend and continue as the San Antonio fault ( Rodríguez...

..., a transitional to continental sedimentary succession was deposited, including the main reservoirs of the Llanos, Middle Magdalena Valley and Axial Zone. The main units in the study area are the Paleocene Socha Group ( sensu   Radelli 1967 ) and the Eocene Picacho Formation. In the Axial Zone the sedimentary...

..., and provenance domains during the Cenozoic evolution of the Magdalena Valley, Eastern Cordillera, and Llanos foreland. These data sets are complemented by new well log data (formational tops and biostratigraphy) and seismic data that define the geographic distribution of facies and thickness of Cenozoic units...