The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . ied,wholly or in part, by the earth and stones borne down bythe ice-sheet. By reference to the chapter upon the MuirGlacier, with the illustration there introduced, the i-eader may ?American Journal of Science, vol. cxxvii, 1884, p. 260 et seq.; , 1885, p. 480 ct seq. TERMINAL MORAINES. 205 easily convince him-self of the correct-ness of this s
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . ied,wholly or in part, by the earth and stones borne down bythe ice-sheet. By reference to the chapter upon the MuirGlacier, with the illustration there introduced, the i-eader may ?American Journal of Science, vol. cxxvii, 1884, p. 260 et seq.; , 1885, p. 480 ct seq. TERMINAL MORAINES. 205 easily convince him-self of the correct-ness of this sugges-tion, Some ofthese kettle - holes,Professor Koonsgoes on to say, arenpon a truly grandscale ; for example,one which containsseveral smaller with-in the large depres-sion, and is like animmense amphithea-tre with the hills ris-ing upon every sideof it. Its highestborder is one hun-dred and fifty feetabove the bottom andthe outlet is fortyfeet above the smalllake at its center ;and on the south side,near its border, butupon still higherground, a bowlderstands projected ao-ain^t the southernsky like a huge sen-tinel as the observerviews it from thebottom of this im-mense pit. * As * American Journal ofScience, vol. cxxvii, p. 206 THE ICE AGE IN NORTH AMERICA. many as eight of those examined by Professor Koons wereupward of eight hundred feet long and about half as wide;the rims from seventy-five to a hundred feet high.
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