REPORT OF THE BOULDER COMMITTEE OF THE 

 OHIO STATE ACADEMY OF SCIENCES. 



BY G. FREDERICK WRIGHT. 



Owing to my absence in Greenland, I have been able to 

 do little in the way of personal work in the identification of 

 boulders in Ohio during the year past. The most important 

 investigations of the year with which I am acquainted are 

 those conducted by Mr. Lynds Jones, of Oberlin, in con- 

 nection with the boulders taken from the sewer ditches, 

 which, to the extent of six miles in length, were dug last 

 3'ear in the streets of the village. For a more specific ac- 

 count of them you are referred to the paper which is to be 

 read by Mr. Jones to the academy at its present meeting. 

 Suffice it to say here that besides the usual boulders from 

 the local rocks and from the familiar lime beds in Lake Erie 

 (the water lime and the corniferous lime stones) there have 

 been found in the lower, or blue till, t^^o varieties of crj-s- 

 talline lime stones of special interest. One of these is com- 

 posed of rather coarse and nearly white crystals making al- 

 most a marble. So far as we know, this is not found in 

 place farther west than near the east end of Lake Ontario in 

 Canada. If this is so, the westerly movement is surprising, 

 and most significant. 



Mr. Jones and Mr. Steven Williams have also found a 

 boulder of water lime containing sulphate of Strontium ( Ce- 

 lestite) in the town of Henrietta, five miles west of Ober- 

 lin. There has been reported to me on the best of author- 

 ity (Mr. H. F. Bassett) a boulder containing celestite 

 found many years ago in Middleburgh township near Berea. 

 Unless there are outcropings of this rock in unknown places 

 these would be referred to Put-in-Bay or Green Island. But 

 it seems hardly probable that the ice movement was in that 

 direction. Still the range of red jasper conglomerate boul- 

 ders to the eastward shows that there were variations in the 

 direction of movements for which our theories have not 

 made adequate allowance. Red jasper conglomerate peb- 



