326 TEE ICE AGE IN NORTH AMERICA. 



interesting verification of an hypothesis anywhere to be found 

 than that furnished for the glacial theory through the study 

 of the character of some of these terraces at and below the 

 glacial limit. Theoretically the terraces should^ for the rea- 

 sons just stated, be more prominent and consist of coarser 

 material, just where the streams emerge from the glacial 

 limit ; and such, from a wide collection of facts, is proved to 

 be the rule. I have myself examined nearly all the streams 

 thus emerging from the glaciated area between the Atlantic 

 Ocean and the Mississippi River.* In scores of places where 

 streams thus emerge from the glaciated region — in Pennsyl- 

 vania, Ohio, and Indiana — their valleys are filled with an 

 accumulation of water-worn northern drift, which, when fol- 

 lowed downward, becomes gradually less in amount, as well 

 as more water- worn, and finer in its constituent elements. 



This is notably the case in the Delaware Valley, at Belvi- 

 dere, N. J.; in the Susquehanna, at Beach Haven, Pa.; in 

 the Conewango (as already described), at Ackley, Warren 

 county ; in Oil Creek, above Titusville ; in French Creek, 

 a little above Franklin ; in Beaver Creek, at Chewtown, Law- 

 rence county ; on the Middle Fork of Little Beaver, near 

 New Lisbon, Ohio ; on the east branch of Sandy Creek, at 

 East Eochester, Columbiana county ; on the Nimishillin, at 

 Canton, Stark county ; on the Tuscarawas, at Bolivar ; on 

 Sugar Creek, at Beech City ; on the Killbuck, at Millersburg, 

 Holmes county ; on the Mohican, near the northeast corner 

 of Knox county ; on the Licking River, at Newark ; on 

 Jonathan Creek, Perry county ; on the Hocking, at Lancas- 

 ter ; on the Scioto, at Hopetown, just above Chillicothe ; on 

 Paint Creek, and its various tributaries between Chillicothe 

 and Bain bridge ; and on the Wabash, above New Harmony, 

 Ind. ; to which may be added the Ohio River itself, at its 

 junction with the Miami, near Lawrenceburg. 



Some of these instances are sufficiently interesting and 



* " Glaciated Area of Ohio," in the " American Journal of Science," voL 

 cxxvi, 1883, pp. 1-14; "American Naturalist," vol. xviii, pp. 755— 767. 



