Bulletin of the Geological Society of America, Band 2The Society, 1891 Vols. for 1938-61 include as pt. 2 of the December issue the Society's Abstracts, later published separately. |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
angle anticlinal appear Archean argillites beds belt calcareous Cambrian cañon Carboniferous character clay coal Comanche Comanche series creek Cretaceous crystalline Cuyahoga deposits diabase dikes diorite east eastern eastward elevation erosion evidence fault fauna feet figure fissures folded formation fossiliferous fossils Geological Survey geologists glacial lakes gneiss granite gravel gray hill horizontal Huronian inches island Lake Huron Lake Superior lava layers limestone lithological Logan lower mass metamorphic miles monoclinal mountain northern observed occur Ohio outcrop Paleozoic pebbles peneplain phosphate plane plate plateau Pliocene portion present probably Professor quartz quartzite range region ridge river rocks sand sandstone schists seams shales shore side silicious Silurian slate conglomerate slope southern southward species specimens strata stratigraphic structure surface synclinal terrace Tertiary thickness tion topographic Triassic U. S. Geol unconformity upper valley vertical volcanic Waverly western
Beliebte Passagen
Seite 257 - Descriptive sketch of the physical geography and geology of the Dominion of Canada...
Seite 295 - Lituites, sp. (?) . 110 feet. 4. Gray, tolerably pure limestone in beds 8 to 20 inches thick separated by earthy seams, the bedding being uneven. Many layers consist of crinoidal fragments, largely of Pulceocystites tenuiradiatus, Hall.
Seite 560 - ... apart and terminate in an indurated stratum about 12 inches thick. Small fragments of lignite are scattered about through this stratum, and one or two large masses filled with calcified teredos were found. The only other fossils seen were an Anomia and an Exogyra, probably the young of E.
Seite 285 - ... feet in thickness. The stratigraphical importance of the coal seams is not so great as has been generally supposed, since the bituminous beds are, with very few exceptions, quite limited. Only a single case is...
Seite 97 - ... were accidentally inclosed. From this it is evident that the slate conglomerate was not deposited until the subjacent formation had been converted into gneiss, and very probably greatly disturbed ; for while the dip of the gneiss, up to the immediate vicinity of the slate conglomerate, was usually at high angles, that of the latter did not exceed nine degrees, and the sandstone above it was nearly horizontal.
Seite 561 - Alabama- 30 17. Gray, highly fossiliferous marl. The fossils are nearly if not quite, all bivalves, and are mostly comminuted as if they formed an ancient shore-line. There are numerous shark teeth and a hard black substance resembling in sections the under shell of a turtle, black coprolitic (?) pebbles, and fragments of lignite 3 18.
Seite 252 - Lake Agassiz, the largest of all the glacial lakes of North America, occupying the basin of the Red river of the North and Lake Winnipeg, covered the greater part of Manitoba and a considerable area of eastern Saskatchewan and southwestern Keewatin. The length of Lake Agassiz from south to north extends across nine degrees of latitude, from its mouth at Lake Traverse on the western line of Minnesota, below latitude 46°, to an undetermined northern limit on the Nelson river probably north of latitude...
Seite 291 - Middle" member suggests that the Coal Measures in Iowa may more properly be regarded as forming two, instead of three, divisions. 4. The unconformity of the Lower Coal Measures of Iowa upon limestones of the Lower Carboniferous is much more pronounced than heretofore suspected. The confirmation of this statement is found in excavations recently made at Elk Cliff, at Harvey, at Fairfield, in Jefferson county, and elsewhere. 5. The striking unconformities in the Lower Coal Measures have never been...
Seite 96 - Canada," speaking of the rocks on the north shore of Lake Huron, then recently studied by Mr. Murray, he says : "As these rocks underlie those of the Silurian system, and have not as yet afforded any fossils, they may probably be referred to the Cambrian system (Lower Cambrian of Sedgwick). * * * This Huronian formation is known for a distance of about 150 leagues upon Lakes Huron and Superior.
Seite 553 - ... 37. White coarse conglomerate, the matrix material being calcareous. The quartzose pebbles decrease in size toward the top, and the stratum becomes more argillaceous. There are many casts, but all too obscure for identification _ 18 38.