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 . miles of Louisville,Ky., suddenly bends to the north, leaving a large triangularportion of the State unglaciated. The base of this ungla-ciated triangle extends from Louisville to the Illinois line,and its apex is about thirty miles south of exact course of this part of the boundary is along a linerunning from the neighborhood of Louisvi
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 . miles of Louisville,Ky., suddenly bends to the north, leaving a large triangularportion of the State unglaciated. The base of this ungla-ciated triangle extends from Louisville to the Illinois line,and its apex is about thirty miles south of exact course of this part of the boundary is along a linerunning from the neighborhood of Louisville northwardthrough Clark, Scott, Jackson, Bartholomew, and Browncounties to Martinsville in Morgan county, where it againturns west and south nearly parallel with, and west of, theWest Fork of White River,, through Owen, Greene, Knox,Gibson, and Posey counties, crossing the Wabash Riverinto Illinois, near New Harmony, the seat of Owens cele-brated socialistic experiment. In Illinois the line continues in a southwesterly directionthrough White, Gallatin, Saline, and Williamson counties,where it reaches its most southern limit near the northernboundary of Johnson county, fifty or sixty miles north of BOUNDARY OF THE GLACIATED AREA. 171. Cairo, a little below latitude 38°. From Williamson countyit starts westward upon its final course to the north, reachingthe Mississipi^i River, near Grand Tower, in Jackson this point to the vicinity of St. Louis the Mississippiruns nearly southeast, so that the glacial boundary in its 172 THE ICE AGE IN NOEIH AMERICA. northwest course is coincident with the bhifls on tlie north-east side of the river through Jackson, Randolph, and Mon-roe counties, 111. So far I have traced the houthern boundaiv mvself, andthe information here given is nearly all at iirst hand. Beyondthe Mississippi competent members of the United StatesGeological Sui-vey have traced the course approximately tothe Pacific Ocean. From these data we know that across
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