Geology of the Rangely Oil District, Rio Blanco County, Colorado: With a Section on the Water Supply (Google eBook)

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U.S. Government Printing Office, 1908 - Petroleum - 61 pages
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Page 96 - The individual lesions appear as tense, clear, shiny vesicles, obtuse, round, or ovoid in form, and varying in size from that of a pin head to that of a pea.
Page 46 - ... level to another, and have recorded these mutations in their own organizations. Even the encyclopedic Quenstedt continually expresses his satisfaction in turning from the uncertain indications afforded by the more generalized structures of other mollusca to the decisive chronologic evidence usually given by the fossils of this group.
Page 30 - Pierre as that term is generally understood, though the possibility is recognized that in the typical area the Pierre may have more restricted limits. 6. Faunas similar to that of the Fox Hills sandstone have a great vertical range and are likely to be found at any horizon within the Montana group where a littoral or shallow-water facies is developed.
Page 14 - Batesville sandstone, so named from the town of Batesville, which is built on this sandstone. It is present along the base of the slopes of the isolated hills and mountains north of the Boston escarpment, in Independence, Stone, Searcy, Newton, Boone, Carroll, Madison, Washington, and Benton counties. The rock is coarse, cream-colored to brown, often false bedded, and in some places contains beds of shale interstratified with sandstone. A light sandy soil results from its disintegration. It serves...
Page 28 - Colorado group" of Mr. King, I, for paleontological reasons chiefly, so restrict its application as to Include only what I understand to be equivalent with Nos. 2 and 3 of Meek and Hayden's original section, leaving the equivalent of No. 4 to be included with the strata of the Fox Hills group, instead of with the Colorado group, as Mr. King has done. The...
Page 26 - The Robinson formation includes a succession of variable sediments ranging from shale to conglomerate and composed chiefly of igneous material with occasional lentils of limestone.
Page 17 - Magazine mountains. That part of the Savanna exposed in Arkansas is estimated not to exceed 1,000 feet, and constitutes approximately the lower two-thirds of the formation. The rocks of this formation, as well as the other rocks of the productive coal series, are all more or less folded, so that the shale outcrops depend on the character and direction of these folds and can therefore be determined only after a study of the structure of the region. It can be said, however, that the shale outcrops...
Page 74 - Clay has not been taken from this pit for many years, and the only traces of early operations arc seen in a hollow that was scooped out of the creek bank and has since filled with debris. In a gully about 100 yards north of this opening 4 feet, of lignite outcrops and is overlain by a plastic white clay, similar to Tail's clay, which occurs about one-half mile north of this place. (See p. 76.) Clay was also taken from an old field about one-fourth mile south of the opening first mentioned, but the...
Page 28 - ... certain terms by the various authors in the older work, the differing significance attached to the geologic term Colorado being the principal instance ; second, to establish a stratigraphic and lithologic basis of separation of the formations instead of the previously adopted paleontologic...
Page 30 - Pierre formation (later named Bearpaw, although still assigned to Pierre age) a shale body overlying the Judith River, Claggett, and Eagle formations. The latter three formations are now considered to be in greater part the equivalents of the Mesaverde formation of northwestern Colorado and southern Wyoming sections. In the Colorado and Wyoming fields, however, Pierre has been used to denote beds which normally underlie the Mesaverde formation. The shales above and below the Mesaverde are of similar...

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