Download or read book Structural Geology of the Sierra de Los Cacapas Northeastern Baja California Mexico and Imperial County written by Frederick L. Barnard and published by . This book was released on 1968 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Geology of the Sierra de Los Cacapas Northeastern Baja California Mexico and Imperial County California written by Frederick L. Barnard and published by . This book was released on 1968 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Geology of the Sierra de Los Cucapas Northeastern Baja California Mexico and Imperial County California written by Frederick L. Barnard and published by . This book was released on 1968 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Structure and Petrology of Sierra El Mayor Northeastern Baja California Mexico written by Martin Eric Siem and published by . This book was released on 1992 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mid-Tertiary to recent extension in the southern Salton Trough - northern Gulf Extensional Province has resulted in the formation of the Sierra El Mayor core complex. Structural geometries and style of deformation closely resemble those of the turtleback structures in central Death Valley, as opposed to the core complexes in southeastern California and southern Arizona. Displacement along a stacked system of detachment faults was accomplished by brittle deformation and placed unmetamorphosed late-Miocene to Pleistocene marine and non-marine sedimentary rocks on upper amphibolite facies metamorphic tectonites. The metamorphic rocks have been pervasively intruded by igneous rocks of various ages, ranging in composition from tonalites to monzogranites. Mid-miocene hydrothermal metamorphism retrograded the core rocks to greenschist facies, and clasts of these rocks are found in a syntectonic sedimentary breccia indicating that hydrothermal fluids preceded and facilitated faulting. Foliation within metamorphic rocks has been transposed and refolded into a WNW to NW trending antiform. A parallel trending antiform is defined by the dips on the uppermost detachment fault. Penetrative high-angle conjugate normal faults and fractures that are oriented perpendicular to the antiform have pervasively brecciated the rocks within the core. The maximum strain direction, as determined from the orientation of the high-angle faults beneath the upper detachment, is east-west. This is consistent with kinematic indicators that give a WNW sense of movement on the detachment faults. Orientation of the high-angle normal faults above the upper detachment indicates a more NW - directed maximum strain. The structurally lowest detachment zone exposed represents a mid-crustal shear zone upon which mid- and upper-crustal rocks were tilted and cataclastically deformed in response to the opening to the proto-Gulf. Syndepositional marine sediments were deposited directly on the uplifted shear zone. Continued extension along detachment faults tectonically thinned and removed the late-Miocene to Pliocene marine deposits and locally placed Pleistocene redbeds directly against the metamorphic basement. Subsequent high-angle normal faults that cut the detachments are considered to sole into a presently active mid crustal shear zone. Extension associated with the development of Sierra El Mayor core complex is consistent with Mid-Miocene to present Pacific-North America plate motions.
Download or read book Structural Geology of the Sierra Rancho Nuevo Area Sierra Madre Oriental Northeastern Mexico written by Matthew James Melnyk and published by . This book was released on 1997 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology of Baja California written by Malcolm A. Love Library. Sciences and Engineering Library and published by . This book was released on 1974 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure and Stratigraphy of the Sierra de Los Altares Area Northeastern Chihuahua and Northwestern Coahuila Mexico written by Richard A. Dubiskas and published by . This book was released on 1985 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Middle Paleozoic Strata of the Sierra Las Pinta Northeastern Baja California Norte Mexico written by Paula Jean Leier-Engelhardt and published by . This book was released on 1986 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sierra las Pinta is located 122 km south of Mexicali, Baja California Norte, Mexico. Paleozoic rocks are on the extreme north and south ends of the range. The Paleozoic rocks were studied to describe the stratigraphy, determine if correlations could be made between units in each area and interpret the regional tectonic implications. The section in the northern area (Area 1) is approximately 520 m thick and is divided into six units: Unit 1, calcareous siltstone and calcareous sandy siltstone; Unit 2, siltstone interbedded with calcareous rare crinoidal grainstone and rare granule conglomerates; Unit 3, graded sandy crinoidal grainstone; Unit 4, massive and normally graded beds of coarse sandstone and granule to cobble conglomerate; Unit 5, basalt flows with rare basalt conglomerate and hyalotuffs; and Unit 6, bedded chert and calcareous argillite in thrust contact with underlying units. Lophyophyllid corals and brachiopods from Unit 3 suggest a possible Carboniferous age. The section in the southern area (Area 2) is approximately 720 m thick and is divided into four units: Unit A, bedded chert and argillite; Unit B, fine sandstone, coarse siltstone and granule conglomerate debris flows, probably formed in a submarine fan environment ; Unit C, a deformed limestone and shale sequence ; and Unit D, pillow basalts and basalt flows. Based on conodonts recovered from Unit A and conodont fragments recovered from Unit C, the section is Early Devonian to Early Mississippian in age. Detailed thin section analysis suggests the terrigenous rocks from each area were derived from similar terranes and had a definite cratonal source. The lithic grain population includes quartz arenite and chert grains, no metamorphic lithic grains lithic basalts and a small but persistent percentage of volcanic grains. Minor and trace element analyses of from each area indicate the basalts were erupted during a rifting event, perhaps in a back-arc basin near a continental margin. The rocks from Area 1 and Area 2 cannot be correlated on a one-to-one basis, but could well have been deposited in the same basin. Rocks of similar provenance, age and lithologic associations are found in Baja California Norte, Sonora, and Sinaloa, and all these sections may relate to events which formed the Havallah and Schoonover sequences in Nevada.
Download or read book Prebatholithic Stratigraphy of the Northeastern Sierra La Asamblea Baja California Mexico written by Michael John Campbell and published by . This book was released on 1985 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Structural Geology of Sierra de Sapello Northern Chihuahua Mexico written by Ramon Chavez-Quirarte and published by . This book was released on 1986 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An American Genocide written by Benjamin Madley and published by Yale University Press. This book was released on 2016-05-24 with total page 709 pages. Available in PDF, EPUB and Kindle. Book excerpt: Between 1846 and 1873, California’s Indian population plunged from perhaps 150,000 to 30,000. Benjamin Madley is the first historian to uncover the full extent of the slaughter, the involvement of state and federal officials, the taxpayer dollars that supported the violence, indigenous resistance, who did the killing, and why the killings ended. This deeply researched book is a comprehensive and chilling history of an American genocide. Madley describes pre-contact California and precursors to the genocide before explaining how the Gold Rush stirred vigilante violence against California Indians. He narrates the rise of a state-sanctioned killing machine and the broad societal, judicial, and political support for genocide. Many participated: vigilantes, volunteer state militiamen, U.S. Army soldiers, U.S. congressmen, California governors, and others. The state and federal governments spent at least $1,700,000 on campaigns against California Indians. Besides evaluating government officials’ culpability, Madley considers why the slaughter constituted genocide and how other possible genocides within and beyond the Americas might be investigated using the methods presented in this groundbreaking book.
Download or read book Bibliography of North American Geology written by and published by . This book was released on 1909 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Emeralds of Pakistan written by A.H. Kazmi and published by Springer. This book was released on 1990-06-30 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palaeoseismology written by Klaus Reicherter and published by Geological Society of London. This book was released on 2009 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the tremendous toll in human lives and attendant economic losses, it is appropriate that scientists are working hard to understand better earthquakes, with the aim of forecasting and, ultimately, predicting them. In the last decades increasing attention has been paid to the coseismic effects on the natural environment, creating a solid base of empirical data for the estimation of source parameters of strong earthquakes based on geological observations. The recently introduced INQUA scale (Environmental Seismic Intensity-ESI 2007 Scale) of macroseismic intensity clearly shows how the systematic study of earthquake surface faulting, coseismic liquefaction, tsunami deposits and other primary and secondary ground effects can be integrated with 'traditional' seismological and tectonic information to provide a better understanding of the seismicity level of an area and the associated hazards. At the moment this is the only scientific means of equating the seismic records to the seismic cycle time-spans extending the seismic catalogues even to tens of thousands of years, improving future seismic hazard analyses. This Special Publication covers some of the latest multidisciplinary work undertaken to achieve that aim. Eighteen papers from research groups from all continents address a wide range of topics related both to palaeoseismological studies and assessment of macroseismic intensity based only on the natural phenomena associated with an earthquake.
Download or read book A Critical Revision of the Genus Aristida written by Jan Theodoor Henrard and published by . This book was released on 1926 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Century Reference Library of the World s Most Important Knowledge written by and published by . This book was released on 1909 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Map of the World Africa written by Food and Agriculture Organization of the United Nations and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
