IVAVERLY SERIES OF CENTRAL OHIO 21 5 



No attempt is made, however, to correlate the formations with 

 those of the sub-Carboniferous of other states : 



Feet 



6. Logan formation (Andrews) - 115 



5. Black Hand formation (Hicks) - 4o-(l20?) 



4, Cuyahoga formation (Newberry) - - 275-300 



3. Sunbury shale (Hicks) - - 10-15 



2. Berea grit (Newberry) - - - 40 



1. Bedford shale (Newberry) - - - 85 + 



Bedford shale was named by Newberry in 1870 1 from the 

 outcrops at Bedford, southeast of Cleveland, at which place, he 

 later states, the best exposure occurs. 2 The term "Bedford 

 rock" appears in Richard Owen's description of the geology of 

 Lawrence county, Indiana, published in 1862 ; 3 but it was not 

 used as the name of a geological division. This interpretation 

 is apparently confirmed in the subsection of the report devoted 

 to the general description of the sub-Carboniferous limestone 

 where the term " Middle or Lawrence — Crawford sub-Carbonif- 

 erous limestone" 4 is proposed, a name evidently employed to 

 denote a geological division. Mr. E. R. Cunnings, of Indiana 

 University, informs me that the Bedford oolitic limestone belongs 

 in this division. 5 Writers since Owen have used the terms 

 "Bedford stone," " Bedford oolitic stone," and other names for 

 the rock, which was finally excellently described in 1896 by 

 Hopkins and Siebenthal under the formation name of the "Bed- 

 ford oolitic limestone." 6 It is the opinion of the writer, how- 

 ever, that the term "Bedford shale" used by Dr. Newberry as 

 the name of a formation in 1870 is the one that should stand 

 and the Indiana formation name of Bedford oolitic limestone 

 should be dropped. Since the above was written Mr. E. R. 

 Cumings has proposed the name, Salem limestone, for the 

 Bedford oolitic limestone of Indiana. 7 



'Geol. Surv. Ohio, Pt. I, 1870, p. 21. 



2 Rept. Geol. Surv. Ohio, Vol. I, Pt. I, 1873, p. 189. 



3 Rept. Geological Reconnoissance of Indiana during 1859 and i860, p. 137. 



"■Ibid., p. 125. s Letter, January 13, 1901. 



6 Twenty-first Ann. Rept. Ind., Dept. Geol. and Nat. Resources, pp. 291, 298. 



7 Am. Geol., Vol. XXVII, March 1901, p. 147. 



