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 . indicated by the patina with which itwas covered, and by the fact, instantly recognized by , that the form was antique, being intermediatebetween that of paleoliths and modern Indian implements. r— ^ROCK= If o 1 1 mile ^ BROCKS ? U. o L CO ^ fr--y =-r-Q^*ciAt: - igt- Fig. 173.—Section of the Trougih of the Ohio at Brilliant. Locat
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 . indicated by the patina with which itwas covered, and by the fact, instantly recognized by , that the form was antique, being intermediatebetween that of paleoliths and modern Indian implements. r— ^ROCK= If o 1 1 mile ^ BROCKS ? U. o L CO ^ fr--y =-r-Q^*ciAt: - igt- Fig. 173.—Section of the Trougih of the Ohio at Brilliant. Location ofthe implement shown by a *. For full accounts see Popular Science Monthly for De-cember 1895, pp. 157-166. The cumulative evidence of these facts is increased withthe discovery, by Mr. Hilborne T. Gresson, of Philadelphia,in 1886, of implements of similar type in Medora, is situated in Jackson county, about one hundredmiles west of Gincinnati, and is on the border of the glaciatedregion in that State. The situation is upon the East Fork ofWhite River, near where it enters the triangular unglaciatedportion of Southern Indiana as seen in the map of the gla-cial boundary. The eastern border of this consists of sand-. Fig. Iala-olitli of gray flint, found by Mr. II. T. frcsson. May 1886, at Medora, In-diana, in glacial gravol, eleven feet from surface, in bluff on caf^l fork of White River.(Face view ) i No. 4ti,14.).) (Putnam.) I v/ t, ^ mw // Ww / g; / !^^,! 1/^ / / \ Xi- i> ?«• Fit;. —Side view ot lUe prcccflini;. Fiitiiii 652 THE ICE AGE IN NORTH AMERICA stone knobs formed by tlie outcropping of the subearbonif-erous strata, which here dip to the west. The unglaciatedarea is, therefore, considerably higher than that which adjoinsit on the east, and is much cut up into gorges along thedrainage lines, and must have furnished a favorite retreat,both for man and animals, during the maxinmm extension ofthe ice. Mr. Cresson, having been called i
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Keywords: ., bookauthoruphamwarren18501934, bookcentury1900, bookdecade1910
