GEOLOGY OF IvA SALIvK COUNTY. 



43 



forward so as to mix with those in front of them. 



Stretching- across the United States, as has 

 been proved by the labors of Profs. G. Fred 

 Wrig-ht, of Oberlin, Ohio, H. C. Lewis, of Penn- 

 sylvania, T. C. Chamberlain and Roland D. Sals- 

 bury and others, there is a line of such deposits 

 as we should expect to find near the lower end of 

 a glacier — a moraine, g-enerally not one but several 

 of them running- through Northern New Jersey, 

 Central Pennsylvania, Southern Ohio, south part 

 of Indiana and across Southern Illinois, reaching- as 

 far south in the middle of the State as the north 

 part of Johnson county, thence taking- a nearly 

 northwest course to the Mississippi, and beyond 

 for a long- distance. See Bulletin United States 

 Geological Survey, No. 58. 



Now, how shall we account for these phe- 

 nomena? As we have said before, running water 

 is not adequate to the production of such effects, 

 water and floating- ice cannot build moraines, al- 

 though they may and do transport larg-e pieces of 

 rock, but they do not g-rind and g-roove them, and 

 the masses moved by the drift producing- agents 

 seem utterly beyond the power of water to even 

 move. There are blocks of hornblendyte just west 

 of this city 12x10x8 feet in dimensions, or contain- 

 ing at least 960 cubic feet, and weig'hing- not less 

 than seventy-six tons, and many measuring- from 

 ten to twenty cubic feet, and several of a volume 

 of 50 to 100 cubic feet are scattered there. In 

 Whiteside county we measured one 18x16x12 feet, 

 a part of it yet covered by earth, thus containing- 

 over 3,400 cubic feet, and weighing- not less than 

 272 tons, and these are small compared with some 

 others. 



