90 



GLACIAL FORMATIONS OF EKIE AND OHIO BASINS. 



there are rock shelves and remnants of old valley floors on the border 

 of the Ohio at all levels from about 1,050 feet above tide down to about 



Fig. 2.— Map of part of the Upper Ohio drainage system near the siipposerl old divide. 



800 feet. The full correlation will involve more accurate measurements 

 and a closer study of rock textures and other features than has yet been 



