OF DEXISON UNIVERSITY. 



25 



ing the results it may be convenient to give a Ijrief synopsis of the hor- 

 izons as represented in Central Ohio. 



Sandy shales and freestone - - - - - 30 ft. II I3. 



Shales and freestone - - - - - 100 ft. II I2. 



Shale - - - 5 ft. nil. 



Conglomerate II 



Shale -.--..--. 7 ft. 1I2. 



Freestone - 40 fi. IIi. 



CONGLOMER.\TE I 



Shales - - .60 ft. 1 5. 



Shales, concretionary - - - - - - 30 ft. 1 4. 



Lower Berea Shales ...... igo ft.?l3 



Berea grit (Sec. --..... 100 ft.?l2. 



Bedford shale - - - - - - - 40 ft. 1 1 . 



As may be seen by this section, the strata are divided into three 

 portions, the first lying below the Chester limestone in Fairfield 

 Connty, but farther north under the Carboniferous conglomerate, the 

 second portion lying between conglomerates I and II, while division I 

 rests on the Huron shale in Franklin County, but in Cuyahoga County, 

 the Cleveland and Erie shales are interposed. For a correct under- 

 standing of the relations of the divisions farther north, it will be neces- 

 sary to give a brief summary of the subdivisions as represented in Lick- 

 ing County. The Bedford shale (Ii) is well exposed at Central Col 

 lege, Franklin County, where it lies immediately upon the Huron shale. 

 It is of a chocolate color and can be easily traced on account of that 

 lithological peculiarity. Five feet above the base, the following char 

 acteristic species were found, Macrodon liamiitonac, Leda diversa and 

 Orthis vamixemi. Lying on this is the Berea grit (1 2) which may be 

 one hundred feet thick but absence of exposures renders it very un- 

 certain Next in order is the Lower Berea shale (I3). 



The stratigrajjhical relations of this portion uf the Waverly have 

 not been made out, but it may be 180 feet thic k. Two fossiliferous 

 layers are contained within this subdivision as far as known, the first 

 being well exposed on Rocky Fork, three miles from Oahana. Frank- 

 lin County. Only two species were obtained here, viz: Orbuuloiddi 

 newbetryi and Liu<^ula viclie, which are very abundant at a considerable 

 distance above this. In the same subdivision is another fossiliferous 

 zone from which many specimens may be obtained by a |»atient collect- 

 or. Atripil reticularis, Strophomena rhomboidalis and Pra-tus hildnnnui, 

 with several other species, are found in this stratum. Resting on the 



