An American Geological Railway Guide: Giving the Geological Formation at Every Railway Station, with Altitudes Above Mean Tide-water, Notes on Interesting Places on the Routes, and a Description of Each of the FormationsD. Appleton, 1890 - 426 páginas |
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Alluvium anticlinal Archæan Azoic beds belt Black bluffs Branch Calciferous Cambrian Cañon Carb Carboniferous Catskill Central Chazy Chemung Chicago Cincinnati City clay Clinton Coal Meas Coal Measures Coal Mres conglomerate Corniferous County Creek Cretaceous crosses Dakota deposits Devonian Diorite Division east Eocene Erie extensive Falls feet thick formation fossils Galena Genesee geological geologists Glacial Drift Gneiss Granite gravel Grit Hamilton hills Hudson River Huron Huronian iron Junc Junction Lake Laramie Laurentian lime limestone Loess Louis Lower Coal Magnesian marl Medina Metamorphic Mica Schist miles Mills Millstone Grit mines Miocene Montalban Moraine Mountain Niagara Northern Ohio Oriskany outcrop Pacific Pennsylvania Pittsburgh Pliocene Port Portage Potsdam Prof quarries Quartzite Quaternary Railroad Railway Ridge road rocks Salina sand sandstone schists shales Silurian slates Springs station strata Sub-Carb Sub-Carboniferous Summit Tertiary Trenton Triassic Upper Coal Utica Valley volcanic Waverly Western York
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Página 1 - PREFACE TO THE SECOND EDITION The first edition of this book was...
Página 319 - Approaching from the sea, the coast presents a bold outline. On the south, the bordering mountains come down in a narrow ridge of broken hills, terminating in a precipitous point, against which the sea breaks heavily. On the northern side, the mountain presents a bold promontory, rising in a few miles to a height of two or three thousand feet. Between these points is the strait — about one mile broad, in the narrowest part, and five miles long from the sea to the bay. Passing through this gate...
Página 418 - ... valley is of an oval form ; it contains 55 miles in length, and 37 in breadth. The territorial extent of the valley is 2,200 square miles, of which only 198 square miles are occupied by the lakes, which is less than a tenth of the whole surface. The circumference of the valley, reckoning from the crest of the mountains which surround it like a circular wall, is 201 miles. This crest is most elevated on the south, particularly on the southeast, where the great volcanos of La Puebla, the Popocatepetl...
Página 319 - The bay of San Francisco has been celebrated, from the time of its first discovery, as one of the finest in the world, and is justly entitled to that character even under the seaman's view of a mere harbor. But...
Página 110 - On the opposite side of the river may here be seen for many miles the Palisades, a long, rough mountain ridge close to the water's edge. Its upper half is a perpendicular precipice of bare rock of a columnar structure from 100 to 200 feet in height, the whole height of the mountain being generally from 400 to 600 feet, and the highest point in the range opposite Sing Sing 800 feet above the Hudson, and known as the High Torn. The width of the mountain is from a half mile to a mile and a half...
Página 35 - ... well to notice before describing each in detail. Both are made up of alternations of shales and sandstones. In the Chemung the strata are more silicious, while in the Portage they are more argillaceous. In the latter the sandstone is always finer grained and the shale more clayey than in the former. The Portage sandstones are flaggy and at times very shaly, and their alternations with the shale are very frequent, although the individual strata are quite thin, the shale predominating. The...
Página 110 - ... length it extends from Bergen Point below Jersey City to Haverstraw, and then westward in all 48 miles, the middle portion being merely a low ridge. The lower half of the ridge on the river side is a sloping mound of detritus, of loose stones, which has accumulated at the base of the cliff, being derived from its weathered and wasted surface. This talus and the summit of the mountain are covered with trees, with the bare rocky precipice called the Palisades between...
Página 44 - ... Mastodon, Testudo, etc., some of which are scarcely distinguishable from living species. All fresh water and land types." "On the Loup Fork of Platte River extending to an unknown distance beyond the Platte.
Página 353 - 2. The name Jurasso-Triassic is preferred for the Mid-Secondary rocks of the Virginia reports, as it is thought to correspond best with the fossil indications thus far furnished by the several belts included in it. Of these, the most western area is in part continuous with the so-called Triassic belt of Maryland and Pennsylvania, and in part with the coal bearing rocks of Dan River, Morth Carolina.