Browsing by Subject "Petrology -- Texas"
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Item Chemical analyses of Texas rocks and minerals(University of Texas at Austin, 1918) Schoch, Eugene P. (Eugene Paul), b. 1871Item Depositional systems in the Wilcox Group of Texas and their relationship to occurrence of oil and gas(University of Texas at Austin. Bureau of Economic Geology, 1967) Fisher, W. L. (William Lawrence), 1932-; McGowen, J. H.Regional investigation of the lower part of the Wilcox Group in Texas in outcrop and subsurface indicates seven principal depositional systems. These include: (1) Mt. Pleasant Fluvial System developed updip and in outcrop north of the Colorado River;(2) Rockdale Delta System, present primarily in subsurface, chiefly between the Guadalupe and Sabine Rivers; (3) Pendleton Lagoon-Bay System in outcrop and subsurface largely on the southern flank of the Sabine Uplift; (4) San Marcos Strandplain-Bay System, occurring in outcrop and subsurface mainly on the San Marcos Arch; (5) Cotulla Barrier Bar System in subsurface of South Texas; (6) Indio Bay-Lagoon System developed updip and in outcrop of South Texas; and (7) South Texas Shelf System, an extensive system entirely within subsurface of South Texas. The Rockdale Delta System, consisting of large lobate wedges of muds, sands, and carbonaceous deposits, is the thickest and most extensive of the lower Wilcox depositional systems. It grades updip to the thinner terrigenous facies of the Mt. Pleasant Fluvial System. Deposits of the Rockdale Delta System were the source of sediments redistributed by marine processes and deposited in laterally adjacent marine systems. Delineation of depositional systems and, more specifically, delineation of component facies of the various systems, permits establishment of regional oil and gas trends which show relationship of producing fields and distribution of potentially producing trends.Item Lithology and petrology of the Gueydan (Catahoula) formation in South Texas(University of Texas at Austin. Bureau of Economic Geology, 1968) Lindemann, William L.; Freeman, Paul S.Tuff, tuffaceous sand and clay, bentonite, and sandstone containing abundant volcanic rock detritus are present in Gulf Coast Tertiary rocks ranging in age from Eocene to Pliocene. This report summarizes the results of a stratigraphic and sedimentologic study of outcrops of one unit of the sequence, the Gueydan (Catahoula) Formation, from south of the Colorado River, Texas, to the Rio Grande. It is one phase of a study of middle Tertiary volcanism in southern Texas and northeastern Mexico. The long-range purposes of this project are (1) to determine the petrogenesis and provenance of Gulf Coast Tertiary sedimentary rocks rich in volcanic rock detritus, and (2) to map, describe, and interpret previously unstudied Tertiary volcanic and hypabyssal rocks in northeastern Mexico.Item Nomenclature revision of basal cretaceous rocks between the Colorado and Red Rivers, Texas(University of Texas at Austin. Bureau of Economic Geology, 1966) Fisher, W. L. (William Lawrence), 1932-Based on need for convenient, small-scale cartographic units, the basal Cretaceous rocks in Texas from Red River to Burnet County and on the Callahan Divide are herein divided into three distinctive lithologic sequences. These are recognized by changes in facies and by the presence or absence of overlying definitive units and include: (1) North-central Texas sequence overlain by the Glen Rose Formation and characterized by siliceous conglomerates and lack of carbonate units (Twin Mountains Formation) (new name); (2) North Texas and West-central Texas sequences extending beyond pinch-out of the Glen Rose Formation with basal and stratigraphically higher clastics included in a single unit (Antlers Formation); (3) Central Texas sequence overlain by Glen Rose Formation but characterized by carbonate units and coarse, locally derived, limestone and dolomite conglomerates (Travis Peak Formation). The outcrop sequence of North-central Texas grades eastward in the subsurface to a basinal sequence overlain by the Glen Rose Formation and divided into (in ascending order) the Hosston, Sligo, Pearsall, and Hensel Formations. The name Trinity is confusing in its various uses and should be reserved for higher rank units, i.e., Group or Division, where such units are judged necessary and are clearly defined in areal scope as well as vertical sequence.Item Reconnaissance in the Rio Grande coal fields of Texas; including a report on igneous rocks from the San Carlos coal fields(Geological Survey (U.S.), 1900) Vaughan, Thomas Wayland, 1870-1952Item Stratigraphy and petrology of the Tascotal Mesa quadrangle, Texas(University of Texas at Austin. Bureau of Economic Geology, 1953) Erickson, Ralph Leroy, 1923-The Tascotal Mesa quadrangle is in southeastern Presidio and southwestern Brewster counties, Trans Pecos Texas. Bandera Mesa and Tascotal Mesa are reached most easily from Marfa, 50 miles north, by the Marfa-Lajitas road which traverses the quadrangle from north to south. Green Valley in the northeastern part of the area is most easily reached from Marfa by the 02 Ranch road in Paradise Valley; an alternate route is from Alpine by the Terlingua highway and the 02 Ranch road. This investigation is primarily concerned with a thick succession of volcanic tuff and and related sediments with intercalated lava flows which Goldich and Elms (1949, p. 1143) named the Buck Hill volcanic series. Six months was spent in the field during the summer of 1949 and the spring of 1950. Mapping was done on aerial photographs and later transferred to the U.S. Geological Survey topographic quadrangle map (ed., 1944; surveyed in co-operation with the War Department).Item Texas rocks and minerals ; an amateur's guide(University of Texas at Austin. Bureau of Economic Geology, 1964) Girard, Roselle M., 1918-Texas has a great variety of rocks and minerals; some are common and others are not. This book is designed to acquaint you with some of them and to tell you in a nontechnical way what they are like, some of the places where they are found, and how they are used. Although we do not know exactly how all of the rocks and minerals formed, some of the ideas about their origin are mentioned. If you would like to learn more about rocks and minerals in general, the names of several reference books are listed on page 100. In addition, scientific reports that describe in detail many of the rocks and minerals of Texas have been published by the Bureau of Economic Geology of The University of Texas, the United States Geological Survey, and other organizations. A selected list of these reports is given on pages 100-101. Rocks and minerals are familiar objects to all of us. We pick up attractive or un usual pebbles for our collections, we ad mire rocky mountain peaks, we speak of the mineral resources of our State and Nation. Rocks and minerals enter, either directly or indirectly, into our daily living. From them come the soils in which grow the grains, the fruits, and the vegetables for our food, the trees for our lumber, and the flowers for our pleasure. The iron, copper, lead, gold, silver, and manganese, the sulfur and salt, the clays and building stones, and the other metals and nonmetals that we require for our way of living were once a part of the earth's crust.Item The Gueydan, a new middle Tertiary formation from the southwestern coastal plain of Texas(University of Texas at Austin, 1926) Bailey, Thomas L. (Thomas Laval), b. 1897