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Robert Thomas Hill (August 11, 1858 – July 20, 1941) was a significant figure in the development of American geology during the late nineteenth century and in the early part of the twentieth century. As a pioneer Texas geologist, Hill discovered and named the Comanche Series of the Lower Cretaceous, and was a lifelong student of the structure and stratigraphy of the Cretaceous deposits of Central Texas and neighboring regions. Robert T. Hill was born on 11 August 1858 in Nashville, Tennessee. He was orphaned at the age of five during the American Civil War and then raised in the home of his grandmother. In 1874, at the age of 16, Hill boarded a train and traveled to where the tracks ended in east Waco, Texas. From there he found his way to the frontier town of Comanche, Texas, located to the west of Waco where he joined his brother, Joe, the editor of ''The Comanche Chief'' newspaper. Robert worked as a printer for the newspaper and performed various other duties including writing, bookbinding, and eventually became co-editor of the paper. During the summer of 1876, Hill joined a survey crew headed to the rolling plains between the eastern edge of the Llano Estacado and Fort Griffin, Texas. The work, although somewhat tedious at times, provided an opportunity for Hill to explore the “redbed country” of west-central Texas. This land of reddish brown sediments and rock has been carved by years of erosion leaving behind scenic mesas and buttes that preserve clues to the regions geologic past. In 1877, at the age of 19, Hill accepted an offer to work as a cowboy driving a large herd of cattle from Uvalde, Texas, to Dodge City, Kansas. The cattle drive took many months, during which time he learned to live outdoors for extended periods and developed frontier skills that would prove valuable in later years as he worked as a field geologist.〔Alexander, N. 1976. Father of Texas Geology: Robert T. Hill. Dallas: Southern Methodist University Press, 317 pp.〕 Returning to work again at ''The Comanche Chief'' newspaper, Hill began to spend idle time exploring the local terrain. His interest in geology grew as he took special interest in the many flat-topped mesas and buttes in the region. One butte in particular, named Round Mountain, was located only to the northwest of Comanche and he often climbed to the top to enjoy the view. Although he had little knowledge of geology at this point, he found the fossils along its rocky slopes to be fascinating and he began to collect specimens. Hill’s collection of fossils grew and soon cluttered the windowsills and filled the corners of the newspaper office.〔 Through a friend, Hill obtained a copy of ''Wilson’s Fifth Reader'' that contained chapters on various subjects, including a chapter on geology.〔 Hill studied this book and the more he learned the more he wanted to know about geology. He then ordered, through his local drug store, a copy of the ''Manual of Geology'' by James Dwight Dana, one of the leading geologists in North America. Hill carefully studied this book and attempted to place the local stratigraphy into Dana’s scheme of classification. It became apparent that he was dealing with rocks and fossils that had not as yet been described by modern science. This discovery propelled Hill into a lifelong interest in the Cretaceous period – a period when Central Texas was covered by a shallow sea. At some point Hill recognized that the next logical step in his pursuit of geological knowledge was to attend university and obtain a proper education. Through his newspaper connections, Hill found acceptance at Cornell University, which allowed students to take a light course load and work their way through school.〔 In February 1882, Hill left Comanche for Ithaca, New York, to study geology at Cornell. From 1882 through 1885 he worked his way through Cornell University, where he received a B.S. degree in geology in 1887.〔 File:Comanche Chief 2008.jpg| The ''Comanche Chief'' newspaper office in Comanche, Texas in 2008 File:Round_Mountain_2008.jpg| Round Mountain, a butte located to the northwest of Comanche, Texas, where Robert T. Hill first observed Lower Cretaceous fossils and strata. () (30 December 2008) ==Scientific career== The 1880s were a good time for graduating geologists in the United States. There was a great deal of interest in the American West and there was a need for trained geologists. The United States Geological Survey was founded in 1878 and John Wesley Powell had become director in 1881. Powell hired Hill in 1885 to work at the National Museum of the Smithsonian Institution in Washington, D.C. After a year of being assigned menial tasks such as the preparation of the Survey’s fossil collections, Hill was assigned to a three-month field season in his beloved Texas, a period that would provide an opportunity to revisit the Cretaceous deposits of west-central Texas.〔 He traversed portions of the state underlain by Cretaceous deposits accompanied by William Fletcher Cummins of Dallas, another geologist that would prove to be an influential figure in early Texas geology. In 1887, Hill published a 95-page report titled ''The Present Condition of Knowledge of the Geology of Texas''. Although this report was primarily prepared as an undergraduate thesis at Cornell University, it was also published as a Bulletin of the United States Geological Survey.〔Hill, R.T. 1887. The present condition of knowledge of the geology of Texas. United States Department of the Interior, U.S. Geological Survey, Bulletin 45, 95 pp. 〕 Also in 1887, Hill managed to publish a number of important papers in ''The American Journal of Science'' on his findings with regard to the Cretaceous of Texas. Publication of ''The topography and geology of the Cross Timbers and surrounding regions in Northern Texas'', established Hill as the first to recognize the twofold subdivision of the Cretaceous System.〔Hill, R.T. 1887. The topography and geology of the Cross Timbers and surrounding regions in Northern Texas. The American Journal of Science, 3rd Series, 33:291-303.〕〔Hill, R.T. 1887. The Texas section of the American Cretaceous. The American Journal of Science, 3rd Series, 34(202):287-309.〕 The names that he introduced – the Comanche Series applied to the Lower Cretaceous (named after his adopted home town of Comanche, Texas) and the Gulf Series applied to the Upper Cretaceous – remain the standard for stratigraphic nomenclature in the western Gulf Coast region.〔Hill, R.T. and Vaughn, T.W. 1898. The Lower Cretaceous Gryphæas of the Texas Region. United States Department of the Interior, U.S. Geological Survey, Bulletin 151, 66 pp.〕 Throughout the rest of Hill’s professional career he would continue to publish numerous articles focused on various aspects of the Cretaceous Period. In 1888, Hill was invited to fill a newly formed chair of geology at the University of Texas at Austin. Here he would have the opportunity to teach the first courses in geology ever offered in the state of Texas and build a geology department in a new but already prestigious university. However, it was not to last as Hill returned to Washington and the United States Geological Survey and began an appointment with the Artesian and Underflow Investigation in 1890.〔Manning, T.G. 1977. Father of Texas Geology: Robert T. Hill by Nancy Alexander. The Journal of American History 63(4):1033-1034.〕 Hill’s many contributions include the discovery of the western belt of fracture now known as the Texas Lineament, the delineation and naming of the Balcones Fault zone that forms the Balcones Escarpment,〔 Hill, R.T. and Vaughn, T.W. 1898. Geology of the Edwards Plateau and Rio Grande Plain adjacent to Austin and San Antonio, Texas, with reference to the occurrences of underground waters. In: 18th Annual Report of the Director of the U. S. Geological Survey for the year 1896-1897, Part II, pp. 193-321.〕 and the mapping and naming of many of the physiographic provinces of Texas.〔 Hill, R.T. 1890. Classification and origin of the chief geographic features of the Texas region. The American Geologist 5(1):9-29; (2):68-80.〕〔Hill, R.T. 1900. Topographic atlas of the United States: Physical geography of the Texas region. United States Department of the Interior, U.S. Geological Survey, Folio 3, 12 pp.〕 His stratigraphic studies and investigations of underground and artesian waters led to improvements of vast areas of farm and ranch land and served as the foundation for future petroleum exploration.〔 Hill, R.T. 1892. On the occurrence of artesian and other underground waters in Texas, New Mexico, and Indian Territory, together with the geology and geography of those regions. Final Reports of the Artesian and Underflow Investigations of the U. S. Department of Agriculture, 166 pp.〕〔 Hill, R.T. 1892. Notes on the Texas-New Mexican region. Bulletin of the Geological Society of America 3:85-100.〕〔Hill, R.T. 1893. Artesian waters in the arid region. The Popular Science Monthly 42:599-611.〕 In October 1899, Hill led a six man expedition to explore and document the canyons of the Rio Grande. Traveling in three boats, the expedition took nearly an entire month to travel from Presidio to Langtry, Texas. Hill packed photography equipment into the boats, and took a series of photographs, both during and after his river voyage. Two years later, Hill published an article describing his voyage, and describing the Big Bend region in the colorful language of the period.〔 Hill, R.T. 1901. Running the cañons of the Rio Grande. The Century Illustrated Monthly Magazine 61:371-387.〕 File:Rio Grande RT Hill 1899b.jpg|Hill's survey party enjoying a meal along the banks of the Rio Grande, Brewster County, Texas (1899) File:Hill_1899_RioGrande.jpg| Hill's survey party leaving the canyons of the Rio Grande at Langtry. (28 Oct. 1899) Near the turn of the century Hill conducted studies in the West Indies and the Isthmus of Panama, areas he considered fundamental to understanding the geological evolution of North America.〔Aldrich, M.L. 1977. Review: Father of Texas Geology: Robert T. Hill by Nancy Alexander. The American Historical Review 82(2):451-452.〕 In 1902, following the eruption of Mont Pelée, Hill joined the relief expedition to Martinique that sailed on U.S.S. Dixie.〔 Hill, R.T. 1902. On the volcanic disturbances in the West Indies. The National Geographic Magazine 13(7):223-267.〕 He mapped the destruction area and wrote the first account of the devastating effects of dense, fast-moving clouds of hot gas and rock known as pyroclastic flows or nuée ardente, previously unknown to vulcanologists.〔 Hill, R.T. 1904. The destruction of St. Pierre (A.D. 1902). In: Singleton, E. (ed.), The World's Great Events, New York: P.F. Collier, Vol. 5, pp. 2413-2425.〕 In 1921, Hill provided expert testimony in the boundary dispute case between Oklahoma and Texas. The decision rendered by the Supreme Court on January 15, 1923, found in favor of Texas and returned to Texas of Red River Valley land that was known to contain significant oil deposits.〔Sellards, E.H., Tharp, B.C. and Hill, R.T. 1923. Investigations of the Red River made in connection with the Oklahoma-Texas boundary suit. University of Texas, Bulletin 2327, pp. 37-59.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Robert T. Hill」の詳細全文を読む スポンサード リンク
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