Download or read book Subdivision and Subsurface Correlation of the Ellenburger Group in North central Texas written by Charles Leo Hendricks and published by . This book was released on 1942 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A series of rocks known as the Ellenburger group of Texas was deposited during Upper Cambrian and Lower Ordovician time. The Ellenburger group is composed of a succession of limestones and dolomites reaching a maximum thickness of over 2000 feet, from which the group thins and disappears in certain underground areas. A series of faunal zones have been recognized within the group, which serve to identify the age of various sections found on its outcrop. The group is marked by a large unconformity at the top throughout most of its extent, but over a portion of its occurrence it is overlain by sediments of Middle Ordovician age, in apparent conformity. Interpretation of faunal evidence has indicated that an unconformity exists at the base of the group. The structural attitude of the Ellenburger is obscured by the unconformity at its top, since contours drawn on the old erosion surface actually present a topographic picture rather than an unmodified structural picture. The sedimentary history of the Ellenburger is not known, hence there is uncertainty as to what part of the change in thickness exhibited by the group is due to non-deposition, and what part is due to erosion subsequent to deposition. Further, a close correlation between the outcropping beds and those in the subsurface extension of the group has not been established. Fossils are never found in well cuttings from the Ellenburger, and only very rarely in cores, hence there has been no age correlation of the subsurface sections. This paper is concerned with the discovery and application of a means of solving the Ellenburger problems outlined above. The recognition of correlative units within the group which are evident from both surface and subsurface data is essential to the solution. Such units must have a lithologic basis, since fossils are not recoverable from well cuttings. The Ellenburger group exhibits a variable alternation of limestones and dolomites of varying textures, which do not offer means of correlation. The insoluble residues from these limestones and dolomites, however, show characteristics peculiar to certain units within the group. The plan of the present paper is to describe these units, show their relation to the faunal units recognized on the outcrop of the group, and illustrate their occurrence in a portion of the subsurface. From the extent and relationships of these units conclusions may be drawn as to the structural and stratigraphic relationships of the Ellenburger group, and the age of the subsurface sections may be determined. A study of samples from the subsurface extent of the Ellenburger has been carried on by the writer over a period of several years. During the years 1940 and 1941 a rapid reconnaisance survey was made of the entire Ellenburger outcrop area, with selected sections studied in detail. In the summer of 1940 a detailed map was made of an area in southeastern San Saba County, showing the outcrop of the recognized subdivisions. The results obtained from those studies form the basis for this report"--Leaves 4-6
Download or read book Correlation Between Surface and Subsurface Sections of the Ellenburger Group of Texas written by Leo Hendricks and published by . This book was released on 1952 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsurface Divisions of the Ellenburger Formation in North central Texas written by Leo Hendricks and published by . This book was released on 1940 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ellenburger Group of Central Texas written by Preston Cloud and published by . This book was released on 1948 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of the Pre Simpson Paleozoic Subsurface Rocks of Texas and Southeast New Mexico written by Virgil Everett Barnes and published by . This book was released on 1959 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Underground Position of the Ellenburger Formation in North Central Texas written by Elias Howard Sellards and published by . This book was released on 1918 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Who s who in American Education written by Robert Cecil Cook and published by . This book was released on 1946 with total page 1390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The University of Texas Publication written by and published by . This book was released on 1959 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalogue of the University of Texas written by University of Texas and published by . This book was released on 1947 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ellenburger Group of Central Texas written by Preston Cloud and published by . This book was released on 1946 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by University of Texas at Austin and published by . This book was released on 1921 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tulsa Geological Society Digest written by Tulsa Geological Society and published by . This book was released on 1964 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petroleum Abstracts written by and published by . This book was released on 1965 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sratigraphy of the pre Simpson Paleozoic subsurface rocks of Texas and southeast New Mexico written by Virgil E Barnes and published by . This book was released on 1959 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ellenburger Group of Central Texas written by Preston Cloud and published by . This book was released on 1948 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lithologic Subsurface Correlation in the Bend Series of North central Texas written by Marcus Isaac Goldman and published by . This book was released on 1921 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Mexico Quarterly written by and published by . This book was released on 1944 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
