MORROW COUNTY. 257 



Winchell, of the Michigan Geological Survey, that the Upper Waverly 

 belongs to the Carboniferous, thus dividing between the Devonian and 

 Carboniferous ages the series usually embraced under the single designa- 

 tion of Waverly. For the upper or fossiliferous portion of the old Wa- 

 verly the term Marshall group has been used by the Michigan Survey, 

 and that name, intended to cover the base of the Carboniferous, ante- 

 dates all other names. It is a question whether the term Waverly should 

 be perpetuated by applying it to a part only of the series to which it was 

 at first given. 



To what extent these subdivisions exist in Morrow county it is not 

 possible to determine from the exposures that occur. It is only known 

 that there is (1st) in the eastern part of the county a fine-grained, shaly 

 sandstone, which is probably some part of the Cuyahoga shale and sand- 

 stone, although having more the lithological characters of the Logan 

 sandstone, its equivalent in the southern part of the State. (2d) Suc- 

 ceeding this shaly sandstone is a valuable series of even-bedded sand- 

 stones, useful for building and extensively quarried, the equivalent of 

 the Berea grit.* (3d) Below this is a blackish slate, although its exact 

 junction with the overlying Berea grit has not been observed. It may 

 be separated from the Berea grit by a thin stratum of shale representing 

 the Bedford shale. The thickness of this black shale has not been made 

 out. It is succeeded by (4th) a considerable thickness of bluish or gray 

 shale, seldom seen exposed. This is followed (5th) by the Huron shale, 

 or black slate, which occurs in the western part of the county. 



Cuyahoga Shale and Sandstone. — The quarry of W. T. Appleman, on the 

 north side of the creek, in section 7, Troy township, is in the sandstones 

 of the Upper Waverly (Marshall). The surface of the country here is 

 generally very broken, the streams having cut deep channels through 

 the Drift and into the rock. These sandstone beds here lie horizontal. 

 They are from one to four inches in thickness. But few feet can be actu- 

 ally seen, but the bluffs and ridges show every indication of being com- 

 posed of beds of the same formation in situ to the thickness of nearly a 

 hundred feet This stone is without the gritty texture of the Berea beds. 

 It is more shaly, and has shining specks. Sometimes the heaviest beds 

 show parting planes, by which they separate into thin layers, giving the 

 whole very much the appearance of a true shale. The surfaces of the 

 beds sometimes show fossils, the most conspicuous and common of which 

 is Productus arcuatus, Hall. One or two specimens of Productus Shumardi- 

 anus, Hall (?), were also observed. South-west from Mr. Appleman's is 



* Graduating below into thin-bedded shaly sandstone. 

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