Download or read book The Michigan Law Quadrangle written by Kathryn Horste and published by University of Michigan Press. This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: A delightful guidebook to one of Michigan's architectural gems
Download or read book The Stanford Quad written by and published by . This book was released on 1894 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1980 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geologic Structure and Occurrence of Gas in Part of Southwestern New York written by Wilmot Hyde Bradley and published by . This book was released on 1938 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1978 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1956 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1974 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Batholith and Associated Rocks of Corona Elsinore and San Luis Rey Quadrangles Southern California written by Esper Signius Larsen and published by Geological Society of America. This book was released on 1948 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The batholith of southern and Lower California is exposed continuously from near Riverside, California, southward for a distance of about 350 miles. In central Lower California it is covered in part by younger rocks, but discontinuous bodies extend to the southern end of Lower California. The batholith is probably over 1000 miles long. Its width is about 60 miles. A strip about 70 miles wide across the northern part of the batholith has been studied ; the western half was mapped in detail, and the eastern half was covered in rapid reconnaissance. In the area studied the batholith intrudes Triassic sediments and Jurassic (?) volcanic rocks along its western border, and Paleozoic sediments along its eastern border. Screens and roof pendants are common within the batholith. The Triassic rocks are mildly metamorphosed in the western part of the area but become progressively more coarsely crystalline toward the east. The Palezoic rocks are rather coarsely crystalline. The metamorphism in large part preceded the intrusion of the batholith, and only locally was there appreciable contact metamorphism. The batholith and older rocks are overlain by Upper Cretaceous and younger sediments. Small bodies of andesite and basalt of Quaternary age are present in the area. The batholith was intruded in early Upper Cretaceous time. The batholith in the area studied was emplaced by more than 20 separate injections. Most of the resulting rock types are found in only one or a few small bodies which are confined to a small area. In the area studied in detail (pi. 1) five types are present in many large, widely sepai-ated bodies, making up about 88 percent of the area underlain by the batholith. In the eastern half of the batholith three more widespread types are present. In the western half of the body the rocks range from gabbro to granite, but in the eastern half several tonalites constitute nearly the whole of the mass. The gabbro is composed of many related rocks. Some have hornblende, some pyroxene ; in some the plagioclase is anorthite, in others it is as sodic as andesine-labradorite. Some of the tonalites contain abundant inclusions that have been almost completely reworked by the magma and have been softened and stretched into thin discs. These inclusions are well oriented, and near the contacts with older rocks they parallel the contacts ; elsewhere they strike about N. 30° W. and dip steeply to the east. One tonalite, whose feldspar is andesine, has scattered crystals with cores of bytownite, and has well-crystallized hornblende with cores of pale uralitic hornblende and remnants of augite. Hornblende and biotite are the predominant mafic minerals of the tonalites and granodiorites. The general strike of the structures of the area have been about N. 30° "W. from Paleozoic to the present time. The Paleozoic and Triassic sediments, the orientation of the inclusions and other structures of the batholith, the elongation of the batholith and the mountain ranges, and the strike of the major faults are in about the same direction. In the batholith and the older sediments the dips are steep to the east. The batholith must have been emplaced by stoping and not by forceful injection. The different rocks of the batholith were formed from the intermediate gabbro by crystal differentiation and assimilation in depth. In early Upper Cretaceous time diastrophism folded the older rocks and formed, in depth, a strip of gabbroic magma about 1000 miles long. A small amount of this magma was intruded nearly to the surface. The deep magma differentiated quietly until its upper part attained the composition of a tonalite. Earth movements then occurred at least five times in rapid succession and caused the injection of the different tonalites. Some of these carry abundant inclusions, indicating a widespread shattering of the wall rock shortly before final emplacement. From time to time local movements caused the injections of the different granodiorites. When the deep-seated magma reached the composition of a light-colored granodiorite, widespread diastrophism moved the main granodiorite upward. Further local moremeut caused the emplacement of the many local granodiorites and granites.
Download or read book Barite World Production Reserves and Future Prospects written by Donald Albert Brobst and published by . This book was released on 1970 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trends in use and production of barite. A geological summary of deposits. Outlook is favorable for discovery of new deposits to meet rising demand.
Download or read book Longman s Magazine written by and published by . This book was released on 1886 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by Pennsylvania. Topographic and Geological Survey Commission and published by . This book was released on 1910 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: No. 10 accompanied by atlas.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Bulletin written by and published by . This book was released on 1983 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology of the Central Roan Plateau Area Northwestern Colorado written by William James Hail (Jr.) and published by . This book was released on 1992 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Coal Resources of the Clintwood and Bucu Quadrangles Virginia written by Henry Hinds and published by . This book was released on 1916 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oil Bulletin written by and published by . This book was released on 1925 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
