Man and the Glacial PeriodFowle, 1892 - 385 páginas |
Otras ediciones - Ver todas
Términos y frases comunes
accumulation Alleghany Alps America animals archæologists basin boulder-clay boulders cave channel clay cliffs coast continuous County Creek débris depth distance drainage drift east elevation England erosion Europe evidence extending facts flint flow formed Fort Snelling geologists glacial deposits Glacial epoch glacial ice glacial motion Glacial period glaciated area glaciated region glaciers gorge granite gravel Greenland height hills hundred feet Ice age ice-front ice-sheet implements Irish Sea Island Lake Agassiz Lake Erie Lake Michigan Lake Ontario land latitude lava loess lower marine mass melting miles Mississippi motion Muir Glacier névé northern northward numerous occur Ohio outlet palæolithic pebbles phenomena Pliocene portion preglacial present Professor Rhône Rhône Glacier ridges River rocks sand shells shore side Somme southern southward species strata streams submergence subsidence surface terminal moraine terraces Tertiary Thenay theory thick thousand feet tion transported Trenton tributary upper valley vicinity western
Pasajes populares
Página 28 - ... observations. The total area of Greenland can not be less than 500,000 square miles — equal in extent to the portion of the United States east of the Mississippi and north of the Ohio. It is now pretty evident that the whole of this area, except a narrow border about the southern end, is covered by one continuous sheet of moving ice, pressing outward on every side toward the open water of the surrounding seas. For a long time it was the belief of many that a large region in the interior of...
Página 245 - Man was on this continent at that period when the climate and ice of Greenland extended to the mouth of New York harbor. The probability is that if he was in New Jersey at that time he was also upon the banks of the Ohio, and the extensive 'terrace and gravel deposits in the southern part of our State should be closely scanned by archaeologists. When observers become familiar with the rude form of these palaeolithic implements they will doubtless find them in abundance.
Página 34 - ... of vast snow-covered mountains and all the precipitations of the atmosphere upon its own surface. Imagine this, moving onward like a great glacial river, seeking outlets at every fiord and valley, rolling icy cataracts into the Atlantic and Greenland seas ; and, having at last reached the northern limit of the land that has borne it up, pouring out a mighty frozen torrent into unknown Arctic space.
Página 274 - One of these skulls is apparently that of an old woman, the other that of a middle-aged man. They are both very thick. The former is clearly dolichocephalic (index 70), the other less so. Both have very prominent eyebrows and large orbits with low retreating foreheads, excessively so in the woman. The lower jaws are heavy, the older has almost no projecting chin. The teeth are large, and the last molar is as large as the others. These points are characteristic of an inferior and the oldest known...
Página 238 - The general structure of the mass is neither that of ordinary boulder clay nor of stratified gravels, such as are formed by the complete rearrangement by water of the elements of simple drift deposits. It is made up of boulders, pebbles and sand, varying in size from masses containing one hundred cubic feet or more to the finest sand of the ordinary sea beaches. There is little trace of true clay in the deposit. There is rarely enough to give the least trace of cementation to the...
Página 211 - Owing to the considerable elevation — 275 feet — of the fifth terrace above the present river bed, its deposits are frequently found far inland from the Monongahela, on tributary streams. A very extensive deposit of this kind occurs on a tributary one mile and a half north-east of Morgantown, and the region, which includes three or four square miles, is significantly known as the
Página 363 - The doubts in regard to this extreme antiquity of man are of three kinds, viz: (1) Doubts as to the Pliocene age of the gravels — they may be early Quaternary. (2) Doubts as to the authenticity of the finds — no scientist having seen them in situ. (3) Doubts as to the undisturbed conditions of the gravels, for auriferous gravels are especially liable to disturbance.
Página 268 - During the excavations it became clear that the bones had been greatly disturbed by water action, that the stalagmite floor, in parts more than a foot in thickness, and massive stalactites had...
Página 33 - But this line of cliff rose in solid glassy wall three hundred feet above the water-level, with an unknown, unfathomable depth below it ; and its curved face, sixty miles in length from Cape Agassiz to Cape Forbes, vanished into unknown space at not more than a single day's railroad travel from the Pole. The interior with which it communicated, and from which it issued, was an unsurveyed mer de glace, an ice-ocean, to the eye of boundless dimensions.
Página 37 - the country seems only a circlet of islands separated from one another by deep...