THE DATE OF THE GLACIAL PERIOD. 603 



found a log of wood three or four feet long and about three 

 inches in diameter. This was in the blue clay, and was ac- 

 companied with traces of mnck. 



There is not space to mention the many other places 

 where wood is reported in the modified drift filling what are 

 perhaps preglacial channels serving as outlets of the melting 

 glacial torrents, and which may therefore have been trans- 

 ported a long distance from their native place. One such 

 was reported to me in the valley of Raccoon Creek, in Gran- 

 ville, Licking county, Ohio, and but a few miles from the 

 glaciated border. This was found ninety-fonr feet below the 

 surface of the terrace, which would bring it about forty feet 

 below the present bed of the stream. A few miles farther 

 up in this same valley so many reel-cedar logs were formerly 

 found beneath the glacial terraces along the valley, and the 

 wood was so fresh, that a flourishing business was for a while 

 carried on in manufacturing household utensils from them. 

 Red cedar is not found in that region now, and these logs 

 are probably of the same period with those described as 

 found in true glacial till in Butler county, and which are so 

 fresh as to preserve still the peculiar odor of the wood. 



Professor Collett reports that all through that portion of 

 southwestern Indiana included within the glacial boundary 

 there are found, from sixty to a hundred and twenty feet be- 

 low the surface, peat, muck, rotted stumps, branches and 

 leaves of trees, and that these accumulations sometimes occur 

 through a thickness of from two to twenty feet. 



We may mention, also, as probably connected with the 

 period of the ice-dam at Cincinnati, the well-preserved or- 

 ganic remains found in the high-level terraces of various trib- 

 utaries of the upper Ohio. In the vicinity of Morgantown, 

 Professor I. C. White, as already noted, reports that, in the 

 terraces which he connected with the period of the Cincinnati 

 ice- dam, the leaves of our common forest-trees are most beau- 

 tifully preserved some distance below the surface, and that 

 logs of wood in a semi-rotten condition were encountered 

 seventy feet below the surface. At Carmichaels, in Wash- 



