Proceedings of the Boston Society of Natural History, Volume 23

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Boston Society of Natural History., 1888 - Natural history

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Page 431 - 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 lude form of these palaeolithic implements they will doubtless find them in abundance.
Page 355 - FREDERICK M°CoY, FGS One vol., Royal 410. Plates, /i. is. A CATALOGUE OF THE COLLECTION OF CAMBRIAN AND SILURIAN FOSSILS contained in the Geological Museum of the University of Cambridge, by JW SALTER, FGS With a Portrait of PROFESSOR SEDGWICK.
Page 434 - Metz found it two years ago, while digging a cistern. In making the excavation for this he penetrated the loess eight feet before reaching the gravel, and there, near the surface of the gravel, this implement was found. There is no chance for it to have been covered by any slide, for the plain is extensive and level topped, and there had evidently been no previous disturbance of the gravel.
Page 444 - At the time of formation of the fifth moraine, the south end of the ice-lobe had been melted back a hundred and eighty miles from its farthest extent, and its southwest side, which at first rested on the crest of the Coteau des Prairies, had retired thirty to fifty miles to the east side of Big Stone Lake and the east part of Yellow Medicine county. During its next stage of retreat this ice-lobe was melted away from the whole of Le Sueur county, and its southeast extremity was withdrawn to Waconia,...
Page 340 - As slab slips on slab, the formerly horizontal beveled surface of every one is canted over, so as to dip in one direction at an angle equal to the change of the inclination of the slabs ; and the surface of every slab is separated from that of its neighbors by faults with upthrow on the side of the direction of dip. The Triassic cover is not strong enough to bridge across from ridge to ridge of the uneven surface thus produced ; its weight is much greater than its strength can bear, and it perforce...
Page 434 - ... with fine clay. There is here a thin covering of loess, or fine loam. On going westward this loess deposit increases in thickness, being at Madisonville, one mile west, about eight feet thick. Further west it is much deeper, and seems to take the place of the gravel entirely. At several railroad cuttings, " till," with scratched stones, appears underneath all.
Page 242 - Hist., vol. xxm, p.' 242, June, 1886. Boston.) Mr. FW Putnam referred to the discovery of the mastodon skull at Shrewsbury a year ago, and described the continuation of the exploration of the peat deposit this autumn by the Worcester Society of Natural History, when a human skull was found. As stated to him by Dr. Raymenton, who took out the human skull, both skulls lay on the blue clay bottom of an ancient pond aud were covered with from 6 to 8 feet of peat formation.
Page 444 - During its next stage of retreat this ice-lobe was melted away from the whole of Le Sueur county, and its southeast extremity was withdrawn to Waconia, in Carver county, where it again halted, forming its sixth or Waconia moraine. The seventh or Dovre moraine marks a pause in its recession when its southeast end rested on Kandiyohi county. Probably nearly all of the southern half of Minnesota was at this time divested of its ice-mantle, while nearly all of the northern half was still ice-covered,...
Page 533 - But it is a very curious circumstance that this adductor muscle is not the same as that which exists in the adult. It lies, in fact, in the fore part of the body and on the dorsal side of the alimentary canal. The great muscle of the adult, fig. 3...
Page 434 - Hills and the observatory, was once much deeper than now, and has been filled in with deposits made when immense glacial floods were pouring down these two streams from the north. The Little Miami was a very important line of glacial drainage, as is shown by the extensive gravel-terraces all along its course, to which the railroads resort for ballast.

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