10 



GEOLOGY OF OHIO. 



Direction op Grooves — Continued. 



Locality. 



West Sister Island (Gilbert)... 



" " intersecting series 



Sylvania, Lucas county (Gilbert)... 

 Monclova, Lucas county " 

 Whitehouse " 



Defiance, Defiance county " 

 Junction, Paulding county " 

 Lima, Allen county " 



Middlepoint, Van Wert co. " 

 Findlay,Hancock county(Winchell) 



Blanchard, Putnam county " 

 Bugar Creek,Putnam county " 

 Auglaize, Putnam county " 

 Seneca, Seneca county " 



intersecting 



and later series (Winchell) 



Amanda, Hancock county 

 Crawford, Wyandot county 

 Crane, Wyandot county 

 Amanda, Allen county 

 Marseilles, Wyandot county 



Grand Prairie, Marion co. 

 Portage, Wood county 

 Otsego, Wood county 



Rock. 



Waterlim'e 



u 



Corniferous limestone... 



Waterlime 



Corniferous limestone . . . 

 Huron shale 



Corniferous limestone . . . 



Waterlime 



n 



Niagara 



a 



Waterlime 



a 



Corniferous limestone . . . 

 Waterlime 



a 



Niagara limestone 



Waterlime 



n 



a 



Niagara limestone 



a a 



ti tt 



Corniferous limestone... 

 Waterlime 



Corniferous limestone . . . 



Number Ob- 

 servations. 



Many. 

 1 



5 

 4 

 1 

 1 

 3 

 3 

 2 

 1 

 2 

 1 

 1 

 1 

 1 



1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 3 

 2 



Bearing. 



S. 80° W. 

 S. 



S. 50° W. 

 S. 62° W. 

 S. 50° W. 

 S. W. 

 S. W. 

 S. 35° W. 

 S. 15° W. 

 S. 45° W. 

 S. 40° W. 

 S. 28° W. 

 S. 50° W. 

 S. 48° W. 

 S. 5°E 



S. 23° W. 

 S. 32° W. 

 S. 20° W. 

 S. 5°W. 

 S. 35° W. 

 S. 10° W. 



a io° e. 



N. S. 

 N. S. 

 S. 50° W. 

 S. 68° W. 

 S. 60° W. 



From these records it will be seen that in the trough of the present 

 Lake the prevailing direction of the glacial striae is 10° south of 

 west, and the movement, as demonstrated by the observations made 

 on Kelley's Island and Put-in-Bay Island by myself, on West Sister 

 Island and at Monclova by Mr. G. K. Gilbert, was from the east west- 

 ward; and farther, that in the basin of the lake, but south-west of the 

 Lake itself, the movement of the glacier was deflected southward until 

 it became south-west. An interesting fact in this connection has been 

 noticed by Mr. Gilbert, Mr. Winchell, and myself, that in this portion of 

 the State a series of glacial marks, which have nearly a north and south 

 bearing, are obliterated by the stronger, fresher, and more numerous 

 grooves of which the bearing is nearly east and west. As I have shown 

 elsewhere, the strife which cover the highlands and southern portions of 

 the State were probably made by the continental gracier which existed 

 during the period of greatest cold, and which had in Ohio a movement 

 from the north toward the south or south-east ; while the glacier which 

 moved from the east westward in the lake basin was a local glacier of 



