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 basin beach beds belt Cambrian Carboniferous character Chazy clays coal coast Comanche Comanche series creek Cretaceous crystalline Cuyahoga deposits diabase dikes diorite drift east eastern eastward elevation erosion evidence fault fauna feet feldspar figure fissures folded formation fossils fragments Geol Geological Survey geologists glacial lakes gneiss granite gravel gray hill horizontal Huronian ice-sheet Lake Agassiz Lake Huron Lake Superior layers limestone lithological Logan lower Maryland mass metamorphic miles monoclinal nearly northern northward observed occur outcrop Paleozoic pebbles peneplain phosphate Piedmont plane plateau Pliocene portion present probably Professor quartz quartzite range region ridge river rocks sand sandstone schists seams shales shore side Silurian slate conglomerate slope southern southward species specimens strata stratigraphic structure surface synclinal terraces Tertiary thickness thrust tion topographic Triassic unconformity upper valley vertical western westward
Beliebte Passagen
Seite 281 - ... 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 595 - 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 shoreline. 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...
Seite 587 - ... 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.
Seite 248 - 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 93 - ... 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 585 - of gray laminated clay. These sands are exposed in a bluff about 100 yards from the river, just south of Rooney's Mill creek, Georgia...
Seite 598 - The harder strata weather out into rootlike shapes, and are sometimes rather argillaceous. Many return dips occur in this stratum, stringing it along the banks for many miles further than it would extend normally.
Seite 188 - At a distance of between 1,400 and i ,500 feet from the mouth of the tunnel, or of between 200 and 300 feet beyond the edge of the solid lava, Mr Neale saw several spear-heads, of some dark rock and nearly one foot in length. On exploring further, he himself found a small mortar three or four inches in diameter and of irregular shape. This was discovered within a foot or two of the spear-heads. He then found a large, well-formed pestle...
Seite 508 - He says : Proceeding westward along the ancient Ouachita shoreline from Arkansas into Texas, the Exogyra texana beds (the Walnut clay and Gryphea breccia) are missing until the escarpment is reached north of Marietta, in Chickasha Nation [Love County, Oklahoma] where they first appear, thinly represented beneath the Goodland limestone.
Seite 597 - Ostrea. The sand sometimes becomes irregularly indurated, and is the source of numbers of small lime springs; forms the lowest part of the bluff at Fort Gaines, Georgia, and in its uppermost 10 feet contains pockets of white sand, enclosed by black clay, the clay resting in "potholes" in the limestone ; estimated' at . 200 Wn.cox GROUP: Nanafalia formation — thickness exposed 175 feet: 42.