42 HISTORY OF OHIO. 



stance attending them. We saw none of them, west of lako 

 Michio-an, between that lake, and the Upper Mississippi. 



They are found, in some instances covering half an acre ul 

 surface — and sometimes, three acres. There is such a depo?- 

 ite, resting on the northeastern end of a diluvial hill, just south 

 of the road leading from Dayton to Cincinnati, about three 

 miles, perhaps less than three miles, southerly of Dayton. 

 There is such a deposite, in the northwestern corner of the 

 town plat of Circleville, partly covered with earth, by some 

 later event than the one which brought these rocks here. There 

 was, when this town was first settled, such a deposite, on the 

 north side of the great mound, in this town. These rocks 

 are found in considerable numbers in Madison county, rest- 

 ing on the surface of that elevated, diluvial plain. 



Considerable numbers, may now be seen, resting on the bed 

 of the Olentangy creek, several miles below the town of Del- 

 aware between that town and Worthington. They have been 

 undermined by the washing away, of the clay slate under 

 them. 



These rocks, have been often used, for millstones and 

 sometimes, one boulder, is so large, as to make several mill 

 stones. These are granitic rocks. They are used too, for 

 underpinnings of houses and barns. The court-house in Mad- 

 ison county, stands on these old rocks. 



By what means, were these rocks, transported here, and 

 left, on our surface? That they have been brought here, long 

 since the revolution, which deposited our sandstone and slaty 

 rocks, of secondary formation ; seems evident, from the fact, 

 that they rest on the surface of a diluvial deposite of rollc^l 

 pebbles. This diluvial deposite of pebbles, &c. 'is more recent 

 than the sandstone and slate rocks. It seems evident, too, 

 that the force which transported our primitive rocks here, was 

 not so great as the one which transported the rounded pebbles, 

 otherwise, the large boulders would have been whirled around 

 the hills, and left at the southern ends of them. 



Northern navigators, often tell us, of icebcrges, floating in 

 polar seas, with rocks, imbedded in fhem. We see the same 



