Preliminary Report of the United States Geological Survey of Montana and Portions of Adjacent Territories: Being a ... Annual Report of Progress ..., Volum 6,Part 1872U.S. Government Printing Office, 1873 |
Altres edicions - Mostra-ho tot
Frases i termes més freqüents
angle appear August basalt base beds Black Butte bones borders camp Carboniferous character clay coal Coalville conglomerate convex Creek crest Cretaceous deposits diameter distance elevation Eocene eruption feet Fire-Hole Fork of Snake formation Fort Ellis Fort Hall fossils Gallatin Gallatin River genus geological Geyser Basin granite Hayden Henry's Fork Henry's Lake hills hot springs Idaho inches July June layers Leidy Length lignite limestones lobes Locality lower Lower Geyser Basin Madison Madison River margin Meek miles Missouri molar Montana Montana Territory Mountains narrow nearly oblique Ogden pass peaks portion posterior quartzite railroad range ridge rocks rounded sandstone secondary veins seen shale shell Silurian slopes Snake River species specimens strata stream surface suture Territory Tertiary Téton Cañon thickness tion trachyte transverse upper Utah Utah Territory valve vertical volcanic Width Wyoming Yellowstone Yellowstone Lake Yellowstone River
Passatges populars
Pàgina 22 - The pass is only four miles from, and 200 feet above, the lake, and so level that it is difficult to locate the exact point at which the waters divide. It is about a mile in width, with the sides sloping gently to the center. The
Pàgina 811 - and when about 50 feet below the summit the electric current began to pass through my body. At first I felt nothing, but heard a crackling noise, similar to a rapid discharge of sparks from a friction machine. Immediately after, I began to feel a tingling or pricking sensation in my head and the
Pàgina 452 - 28. Numerous thin seams and layers of dark carbonaceous shales, with harder thin bands of various colored argillaceous, arenaceous, and calcareous matter, including a few very thin streaks of coal ; the whole being highly charged with vast numbers of fresh and brackish-water shells, such as species of
Pàgina 83 - country as a most conspicuous feature. The fact that the streams seem to have cut their way directly through mountain-ranges, instead of following synclinal depressions, indicates that they began the process of erosion at the time of the commencement of
Pàgina 460 - localities, would certainly strongly favor the conclusion, not only that this Judith formation, the age of which has so long been in doubt, is also Cretaceous ; but that even the higher fresh-water lignite formation at Fort Clark and other Upper Missouri localities may also be Upper Cretaceous instead of Lower Tertiary. That the Judith
Pàgina 83 - instead of following synclinal depressions, indicates that they began the process of erosion at the time of the commencement of the elevation of the surface. This is shown all along the valley of the Yellowstone, and more conspicuously in the valleys of the Madison and Gallatin, which have carved immense canons or gorges directly through two of the loftiest ranges of mountains in Montana.
Pàgina 557 - devouring of the turtles which so abounded on land and in the waters of the same period. The slender symphysis could most readily be introduced into the shell, while the lateral pressure of the upper canines with the lower, would be well adapted for breaking the bony covering of those
Pàgina 225 - several very high peaks covered with snow, from two of which smoke ascended in considerable volumes, apparently from craters in a state of eruption.
Pàgina 491 - obliquely to the marginal sinus below; posterior wing longer and more compressed, narrower, and more angular than the other; both wings, particularly the posterior one, projecting decidedly beyond the margin of the valve below. Surface only showing more or less distinct lines of growth.
Pàgina 10 - during the latter portion of the Cretaceous period, and continued on into Tertiary times without any marked physical break, so that many of the Cretaceous types, especially of the vertébrala, may have lingered on through the