1st -12th Annual Report of the United States Geological and Geographical Survey of the Territories ...U.S. Government Printing Office, 1872 - 12 páginas |
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Términos y frases comunes
angle animals appearance basin Bear River Black's Fork bluffs bones Bridger Bridger's Pass Buttes Camp Cañon carboniferous cattle caudal character Cir.-cu Cir.-str clays coal Colorado Colorado Territory convex Creek cretaceous Cu.-str Denver deposits dorsal east elevation elytra eocene extend Fork of Green formations Fort Bridger Fort Fetterman fossils fragments fresh-water genus geological granite grass gray Green River Henry's Fork hills hundred feet inch inclining irrigated Kansas land Laramie Laramie Plains layers length Lesqx limestone lower margin marls miles miocene Missouri nearly Niobrara River North Platte northwest Oreodon Pass plains portion posterior probably pronotum quartzites range region remains ridge rocks Rocky Mountains Salt Lake sand sandstone Sept shale shells side slope southwest species specimens strata streams summit surface Sweetwater teeth tertiary beds thickness tion Uinta Mountains Union Pacific Railroad upper valley vertebræ width Wyoming Territory
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Página 97 - Notes Explanatory of a Map and Section Illustrating the Geological Structure of the Country Bordering on the Missouri River, from the Mouth of the Platte River to Fort Benton.
Página 173 - ... extent must have been very much greater. The salt, which was very pure and white, averaged from one-half to three-fourths of an inch in thickness, and was equal in all respects to our finest specimens for table use. Assuming these data, the quantity that here lay upon the ground in one body, exclusive of that in a deliquescent state, amounted to over four and a-half millions of cubic yards, or about one hundred millions of bushels.
Página 378 - These plants were figured and described as an appendix to a paper on species of fossil plants from the tertiary of the State of Mississippi...
Página 329 - ... and other marine or estuary mollusks. In due time the continental elevation which brought all the country west of the Mississippi up out of the widespread cretaceous sea, raised these lake basins altogether above the sea level, and surrounded them with a broad expanse of dry land.
Página 333 - Chutes River and Columbia afford splendid sections of these lake deposits, where the history I have so hastily sketched may be read as from an open book. But, it will be said that there are portions of the great central plateau which have not been drained in the manner I have described. For, here are basins which have no outlets, and which still hold sheets of water of greater or less area, such as those of Pyramid Lake, Salt Lake, etc.
Página 431 - ... The size of the fry of the Rocky Mountain herring indicates that they had not long left the ¡spawning ground, while the abundance of adults suggests they were not far from salt water, their native element. To believe, then, that the locality from which these specimens were taken was neither far from fresh, nor far from salt waters, is reasonable ; and this points to a tide, or brackish inlet or river. The species of Cyprinodontidœ inhabit also tide and brackish waters.
Página 319 - Newberry, are probably an undescribed species. Fire-clay is perhaps the predominant material of the formation. It occurs in beds of great thickness, especially in Colorado, and at Golden City it is manufactured into fire-bricks of excellent quality. Clay iron-stone is occasionally interstratified with the clays and black shales, and in Boulder County, Colorado, the summits and sides of some of the hills near the coal-mines are partially covered with masses of brown iron ore, that have the appearance...
Página 130 - Station we come into the black clays of the lower cretaceous, and the appearance of the country becomes dreary and sterile in the extreme. The waters are alkaline, and there is no timber along the creeks except stinted willows, and very little grass or vegetation except chenopodiaceous shrubs, which are fond of this alkaline soil. As far as the eye can reach nothing can be seen but these somber, plastic clays. The surface also presents the characteristic monotonous appearance which is common wherever...
Página 338 - America during the tertiary ages are in all respects, but one, more attractive and interesting than could be drawn from its present aspects. Then a warm and genial climate prevailed from the Gulf to the Arctic Sea ; the Canadian highlands were higher, but the Rocky Mountains lower and less broad. Most of the continent exhibited an undulating surface, rounded hills and broad valleys covered with forests grander than any of the present day, or wide expanses of rich savannah, over which roamed countless...
Página 338 - ... fauna retains but a few dwarfed representatives. Noble rivers flowed through plains and valleys, and sea-like lakes, broader and more numerous than those the continent now bears, diversified the scenery. Through unnumbered ages the seasons ran their ceaseless course, the sun rose and set, moons waxed and waned over this fair land, but no human eye was there to mark its beauty, nor human intellect to control and use its exuberant fertility.