SUKFACE GEOLOGY. 



exposed to the full force of its great waves, and, as a consequence, the 

 denudation has been greater there. In the Maumee valley, however, 

 the yellow laminated clays which form the summit of the Drift series 

 are regarded by Mr. Gilbert, who has carefully examined them, as of 

 lacustrine origin, and of comparatively modern date. 



In the valley of the Cuyahoga — which was a deep gorge previous to 

 the epoch under consideration — we find a series of finely stratified yel- 

 low, blue, and red sandy clays, that overlie all the other Drift deposits. 

 These are very peculiar in character, and seem to represent a portion of 

 the Drift series, which, if once generally deposited in the lake basin, has 

 been for the most part since removed. The nature of these strata may be 

 gathered from the following sections : 



l. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 



LACUSTRINE CLAYS, AKHON, OHIO. 



Feet. 



Stratified sand 10 



Blue clay 



Mixed yellow sand and blue elay, stratified 1 



Blue clay 



Yellow sandy clay 



Blue clay 1 



Bed clay 



Yellow loamy clay 1 



Blue clay 



Bed clay 



Blue clay 



Bed clay 



Blue clay 1 



Bedclay 



Yellow loamy clay 1 



Blue clay 2 



Bed clay 



Fine yellow sand 



Yellow loamy clay 2 



Blue clay 



Yellow loamy clay 3 



Blue clay 4 



LACUSTRINE CLAYS, THREE MILES NORTH OP AKRON. 



Feet. 



Hard concretionary clay, with much iron 25 



Blue clay 8 



Yellow clay 



Blue clay 



Bed clay 



Yellow loamy clay 2 



Inches. 



4 



1 



10 

 10 



8 

 2 

 6 

 10 

 6 

 2 

 6 



1 

 1 



Inches. 



