44 



of Ohio, there seems up to date not to have been taken 

 much notice of boulders brought to their present rest- 

 ing place from localities within the borders of Ohio. 

 It was therefore of no little interest to the author, 

 when he found several of them, partly of large size, in 

 the valley of the Rocky River in Rockford Township 

 and about 3 miles from Lake Erie. They were recog- 

 nized to consist of Corniferous limestone, such as is 

 met with on Kelley's Island. 



The size of the largest one is 10x5 meters, while its 

 highest part above the ground reaches about one 

 meter. The next largest one is lying near it ; it 

 measuses about half as much and was evidently 

 broken off from the former. 



A short distance from there, and about 5 meters 

 higher up the hill occurs an almost round boulder of a 

 diameter of about Vs to V2 meter. 



Nearly a mile further up the river, there is another 

 boulder; the same lies at the side of a hill ( along which 

 a creek sends its waters to the river) and at least 10 

 meters above the river bed ; it measures about IVs to 2 

 meters in diameter. 



Besides the fossils occuring in these boulders which 

 furnished the means to determine the locality, from 

 which they were brought long ago, it was a matter of 

 great interest to find on them several species of lichens, 

 specimens of which had been collected bv him before on 

 the Lake Erie Islands, but which were never met by 

 him on rocks in Cuyahoga, Co., viz. Lecanora sub- 

 fusca, (L) Ach., and Verrucaria rupestris, Schrad. 

 These lichen species were not considered to have been 

 brought with the boulders from the island, although 

 there may exist such a possibility, but thej' were taken 

 as samples to illustrate, and prove the fact, that a 

 lichen species demands, just as plants of higher order 

 do, a soil, be it even a rock, to live on, which will best 

 suit the same for that purpose. 



