Browsing by Author "Gidley, James Williams, 1866-1931."
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Item The fresh-water Tertiary of northwestern Texas : American Museum expeditions of 1899-1901. Bulletin of the AMNH ; v. 19, article 26.(New York : Published by order of the Trustees, American Museum of Natural History, 1903) Gidley, James Williams, 1866-1931.; Cope, E. D. (Edward Drinker), 1840-1897.; Cummins, W. F. (William Fletcher), 1840-1931.; Geological Survey of Texas.; Gidley Expeditions to the Llano Estacado (1899-1901)"Following is a summary of the conclusions reached by the writer from this study of the formations of northwestern Texas: (1) There has been no great disturbance or change of level in the region of the Staked Plains since the close of the Triassic, hence the strata of the Triassic which underlie this whole region are for the most part nearly horizontal, and the country at the beginning of the Miocene was comparatively level. (2) The Panhandle (Lower or Middle Miocene) beds were comparatively evenly distributed over the vast area now occupied by the Staked Plains and in addition extended westward to the Rocky Mountains in New Mexico, and spread out to the eastward over a much greater territiory than they now occupy. These deposits seem to be, at least partially, lacustrine in origin. (3) All the formations of the Staked Plains that are of more recent date than the Lower or Middle Miocene are represented by comparatively small areas, and are fluviatile, or aeolian and fluvaiatile, in origin. These later depositions are represented by the Clarendon beds in the vicinity of Clarendon, the Blanco Beds at Mount Blanco, and the Rock Creek beds at Tule Cañon and Rock Creek"--P. 635.Item Glyptotherium texanum, a new glyptodont, from the Lower Pleistocene of Texas. Bulletin of the AMNH ; v. 19, article 17.(New York : Published by order of the Trustees, American Museum of Natural History, 1903) Osborn, Henry Fairfield, 1857-1935.; Gidley, James Williams, 1866-1931.; Whitney Expeditions (1901-1904)Item A Lower Miocene fauna from South Dakota. Bulletin of the AMNH ; v. 23, article 9.(New York : Published by order of the Trustees, American Museum of Natural History, 1907) Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.Item A new genus of horse from the Mascall beds ; with notes on a small collection of equine teeth in the University of California. Bulletin of the AMNH ; v. 22, article 22.(New York : Published by order of the Trustees, American Museum of Natural History, 1906) Gidley, James Williams, 1866-1931.Item New Miocene rhinoceroses, with revision of known species. Bulletin of the AMNH ; v. 20, article 27.(New York : Published by order of the Trustees, American Museum of Natural History, 1904) Osborn, Henry Fairfield, 1857-1935.; Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.Item New Oligocene horses. Bulletin of the AMNH ; v. 20, article 13.(New York : Published by order of the Trustees, American Museum of Natural History, 1904) Osborn, Henry Fairfield, 1857-1935.; Wortman, Jacob Lawson.; Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.Item New or little known mammals from the Miocene of South Dakota : American Museum expedition of 1903. [Part 1-3]. Bulletin of the AMNH ; v. 20, article 22.(New York : Published by order of the Trustees, American Museum of Natural History, 1904) Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.; Whitney Expeditions (1901-1904)Item New or little known mammals from the Miocene of South Dakota : American Museum expedition of 1903. Part 4, Equidae. Bulletin of the AMNH ; v. 22, article 8.(New York : Published by order of the Trustees, American Museum of Natural History, 1906) Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.Item A new rodent from the Upper Oligocene of France. Bulletin of the AMNH ; v. 41, article 18.(New York : Published by order of the Trustees, American Museum of Natural History, 1919) Miller, Gerrit S. (Gerrit Smith), 1869-1956.; Gidley, James Williams, 1866-1931.; Poirrier, B.; Gaillard, Claude, 1861-1945.Item New species of claenodonts from the Fort Union (basal Eocene) of Montana. Bulletin of the AMNH ; v. 41, article 14.(New York : Published by order of the Trustees, American Museum of Natural History, 1919) Gidley, James Williams, 1866-1931.Item A new species of Pleistocene horse from the Staked Plains of Texas. Bulletin of the AMNH ; v. 13, article 13.(New York : Published by order of the Trustees, American Museum of Natural History, 1900) Gidley, James Williams, 1866-1931.; Gidley Expeditions to the Llano Estacado (1899-1901)Item A new three-toed horse. Bulletin of the AMNH ; v. 19, article 13.(New York : Published by order of the Trustees, American Museum of Natural History, 1903) Gidley, James Williams, 1866-1931.; Wells, H. F.Item Notice of two new Oligocene camels. Bulletin of the AMNH ; v. 20, article 18.(New York : Published by order of the Trustees, American Museum of Natural History, 1904) Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.Item Proper generic names of Miocene horses. Bulletin of the AMNH ; v. 20, article 15.(New York : Published by order of the Trustees, American Museum of Natural History, 1904) Gidley, James Williams, 1866-1931."The chief distinguishing characters of the American Miocene genera as now understood may be given briefly as follows: Hypohippus: Both deciduous and permanent series of teeth brachyodont, no cement; both upper series without external ribs on paracone and metacone; metaloph simple and undivided, but strongly united with the ectoloph; no crochet; metaconid and metastylid of lower teeth undivided or slightly divided by a shallow notch at the summit of an unworn tooth. Parahippus: Both deciduous and permanent series of teeth brachyodont, deciduous series without cement, permanent series sometimes lightly cemented; deciduous upper molars with prominent external ribs on paracone and metacone; metaloph strongly united with ectoloph; crochet well developed, uniting more or less strongly with the protoconule; metastylid strongly developed, with well-marked groove separating it from the metaconid. Merychippus: Deciduous molars brachyodont with little or no cement; permanent series short hypsodont, fully cemented. Protohippus: Both deciduous and permanent series of teeth hypsodont and strongly cemented; permanent series moderately long-crowned; crowns much curved; protocone and protoconule strongly united; fossettes or cement lakes wide transversely with open loops, and usually with comparatively simple enamel borders. Neohipparion: Both deciduous and permanent series of teeth hypsodont and strongly cemented; teeth of permanent series usually longer crowned and upper teeth less curved than in Protohippus; protocone free to near its base as in Hipparion"--P. 194.Item A revision of the geology and paleontology of the Bijou Hills, South Dakota. American Museum novitates ; no. 2300(New York, N.Y. : American Museum of Natural History, 1967) Skinner, Morris F.; Taylor, Beryl E.; Gidley, James Williams, 1866-1931.; Matthew, William Diller, 1871-1930.Item Revision of the Miocene and Pliocene Equidae of North America. Bulletin of the AMNH ; v. 23, article 35.(New York : Published by order of the Trustees, American Museum of Natural History, 1907) Gidley, James Williams, 1866-1931.; Osborn, Henry Fairfield, 1857-1935."In the foregoing revision the lines of comparison and study have been confined principally to characters of the teeth and skull, for the reason that by far the greater number of species of horses have been founded on tooth and skull material not associated with other parts of the skeleton. The expeditions of the last few years however are constantly increasing the collections and adding quantities of more complete material, including many specimens in which teeth and bones of the feet are associated. This class of material will greatly aid in working out more fully than has been done the characters of foot development of horses, and should result in throwing added light on the phyletic relations of the extremely varied groups which seem to have reached their culmination, as regards numbers of genera and species, in the Miocene period. The principal results attained by this study are, first, a better understanding and interpretation of the principal characters shown in the numerous and varied types representing the American Miocene horses; second, the reestablishment and better definition of several of the genera and species proposed by Leidy, the validity of which was questioned by Cope; and third, a reclassification of the entire family of the Equiidae. As at present understood, the fact seems to be fairly well established that there is a considerable phyletic hiatus between the groups of the Equidae as above subdivided, which are as yet not bridged over by intermediate forms. Such a hiatus seems especially marked between the Anchitheriinae and the Protohippinae, while these groups greatly overlap each other in time. So far as indicated by any known species the Anchitheriinae could not well have stood in direct ancestral line to the latter group or to the Equiinae. There seems also to be almost as decided a gap between the Anchitheriinae and the known species of the older group, the Hyracotheriinae. The Equiinae may well have been derived from some species of the Protohippus division of the Protohippinae"--P.933-934.Item A skull of Dinocyon from the Miocene of Texas. Bulletin of the AMNH ; v. 16, article 11.(New York : Published by order of the Trustees, American Museum of Natural History, 1902) Matthew, William Diller, 1871-1930.; Gidley, James Williams, 1866-1931.Item Tooth characters and revision of the North American species of the genus Equus. Bulletin of the AMNH ; v. 14, article 9.(New York : Published by order of the Trustees, American Museum of Natural History, 1901) Gidley, James Williams, 1866-1931.