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abundant andesite anticline apatite arid augite basalt base Basin beaches beds biotite bowlder Bulletin channel character chemical clay Cliff climatic coarse color crater Creek crystals delta deposits described diabase distance earthquake east erosion evidence fauna feet feldspar flow folded formation fossils fragments gabbro Geol Geological Society glacial glaciers gneiss gorge grains granite gravel horizon hornblende Huronian I-ch'ang igneous indicate island Lake lava layers limestone Linosa lower magma magnetite material miles minerals Monte mountains observed occur olivine origin orthoclase pebbles Permian phenocrysts plagioclase plain planes plates portion present probably pyroxene pyrrhotite quartz range region result ridge river rocks sand sandstone sedimentary sediments shales side slopes soil southern species specimen Spirijer strata stream structure surface thickness tion Triassic Trinacromerum tuff U. S. Geological Survey upper valley volcanic Yang-tzi zone
Seite 264 - So gloomy, cold, and wet was every part that not even the fungi, mosses, or ferns could flourish. In the valleys it was scarcely possible to crawl along, they were so completely barricaded by great mouldering trunks which had fallen down in every direction.
Seite 778 - The various finds of human remains in North America for which geological antiquity has been claimed have been thus briefly passed under review. It is seen that, irrespective of other considerations, in every instance where enough of the bones is preserved for comparison the somatological evidence bears witness against the geological antiquity of the remains and for their close affinity to or identity with those of. the modern Indian. Under these circumstances but one conclusion is justified, which...
Seite 490 - Report on a Geological Survey of the Lands Belonging to the New York and Texas Land Company, Ltd., in the Upper Rio Grande Embayment in Texas by Johan August Udden.
Seite 87 - Zinc and Lead Deposits of the Upper Mississippi Valley. US Geol. Survey Bull. 294 (1906) 1-155.
Seite 365 - The sand-grains, as they are continually pushed onward over each other upon the bottom of a river, become rounded as the larger pebbles do. But a limit is placed to this attrition by the size and specific gravity of the grains.
Seite 265 - The gloomy depth of the ravine well accorded with the universal signs of violence. On every side were lying irregular masses of rock and torn-up trees; other trees, though still erect, were decayed to the heart and ready to fall. The entangled mass of the thriving and the fallen reminded me of the forests within the tropics — yet there was a difference : for in these still solitudes, Death, instead of Life, seemed the predominant spirit.
Seite 183 - ... occasionally conglomeratic, of the Connecticut Valley, with the predominantly gray conglomerates and black shales of the Carboniferous basin of Rhode Island; the two regions being separated by less than fifty miles, and both containing sediments of rather local origin. There are strong evidences in each case indicating subaerial origin, much of which however is not published. The dominant red color of the whole of the Triassic formation, considered in connection with its feldspathic sandstones...
Seite 623 - ... sedimentary rocks among which limestones predominate, resting upon and invaded by enormous bodies of gneissic granite. The sedimentary series is largely developed to the south-east where it is comparatively free from igneous intrusions. Towards the north-west, however, the granite, in ever-increasing amount, arches up the sedimentary series and wells up through it, in places disintegrating it into a breccia composed of shreds and patches of the invaded rock scattered through the invading granite,...
Seite 94 - The Cause of Earthquakes, Mountain Formation and kindred phenomena connected with the Physics of the Earth,