NOMENCLATURE OF THE OHIO FORMATIONS 535 



and the base of a conglomerate overlying the Pt. aux Barques 

 gritstones.^ This comprised a much greater stratigraphic range 

 than the Huron shales of Newberry, since on the Ohio scale it 

 represents approximately all the rocks from the base of the 

 Huron shales nearly to the top of the Cuyahoga, and perhaps 

 into the Black Hand formation. - 



Newberry, however, in his first description of the Huron 

 shales, did not refer to the Huron group of Winchell, although 

 together they had examined the rocks about Cleveland 3; but in 

 a later report he stated that in Michigan they form " the lower 

 part of Professor Winchell's Huron groups And he further- 

 more said that the two members of Winchell's Huron group 

 "having nothing in common either in lithological characters or 

 fossils, we have in Ohio separated them ; giving the name Erie 

 shale to the upper portion, retaining the name of Hiiroji for the 

 lower." ■♦ This plan, however, does not appear to have been a 

 happy solution of the question, and it was, therefore, submitted 

 to the Committee on Geologic names of the U. S. Geological 

 Survey, and the chairman, Mr. Bailey Willis, has sent me the 

 following communication : 



• Huron group or Huron shale was brought before the committee through 

 a letter from Professor Prosser of May 28, 1903, the question being whether 

 a formation .... the Huron shale .... may bear the same name as a 

 group to which it belongs ; it was the sense of the committee that such use 

 of terms in duplication was contrary to the regulations of the Geological 

 Survey, and that, as the group had been named in 1861 and the shale not 

 until 1869 [1870], the term Huron should be applied to Xh^ group? 



In 1893 A. C. Lane named the shales forming the lower part 

 of Winchell's Huron group the " St. Clair, " which were included 

 between the Traverse group and the Richmondville or Berea 

 sandstone of the Michigan formations. ^ Dr. Lane has written 

 me that: " I do not now think that [the Richmondville] is 



'Geo!. Surv. Mich., First Bien. Kept. Prog., 1861, pp. 71, 139. 

 ^See Lane, Geol. Surv. Mick., Vol. VII, Part II (1900), PI. I. 

 3Geol. Surv. Mich., First Bien. Kept. Prog., 1861, p. 78. 



4 Kept. Geol. Surv. Ohio, Vol. 1, Part I (1873), p. 70. 



5 Letter of June 13, 1903. 



^ Mich. Geol. Surv., Rept. State Board for i8gi and iSgs, p. 66. 



