Papers on the Quaternary in New England; Including the Glacial and Fluvial Phenomena, or the Drift, and Terraces baixar o livro de graça

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884. Excerpt: ... north of the Ohio may have been increased somewhat less than over New England. From the condition of Greenland, --a semi-continent, covered by a continuous glacier-mass more than a thousand miles long The chief sources of information with regard to the interior of Greenland are: (1) the exploration, in July, 1870, of Nordenskiold over the ice for 28 miles, sixty miles south of Jakobshavn, near the parallel of 68 20', (Geol. Mag. for 1872); and (2) that of Lieutenant J. A. D. Jensen, in 1878, with Mr. A. Kornerup as geologist, who started on the Frederikshaab glacier, between the parallels of 62 and 63, and traveled 47J miles in an E.N.E. direction (Meddelelser om Gronland, Copenhagen. 1879. Part first). 1. The black part, ice; white, land; shaded, water; J. N.. Jensen's Nunataks; B. K., DalaicerV Nunataks; white lines on the black, crevasses: arrows, glacier-flow. Nordenskiold saw an undulating surface of ice, white and moraineless, much intersected by crevasses, and furrowed by innumerable rivers, and one "copious. deep and broad river between banks of blue ice," whose banks he followed until he saw " the whole immense mass of water rush down a perpendicular crevasse into the depths below." There was dust over portions of the surface, and with it, as detected by liis companion, Mr. Berggreu, great quantities of a minute alga, in the form of threads of usually 4 or 8 cells, along with some Protococcua nivalis, and, in one place, so much of the material lay together, (collected by streams then dried up), that it had become putrescent in the sun, "so as to emit a most unpleasant odor, like that of butyric acid." Nordenskiold says that the alg- tend to make rapid melting of the ice under the summer's sun. The height reached by Nordenskiold and several h...