536 CHARLES S. PROSSER 



the Berea but a stray sandstone, somewhat higher up."' In 

 the Ohio formations the "St. Clair shale " represents approxi- 

 mately the rocks from the top of the Olentangy shale to the base 

 of the Berea grit, and therefore is neither synonymous with 

 Newberry's Huron shale nor with Andrew's Ohio shale, since 

 the equivalent of the Bedford is included in the St. Clair 

 shale. The name "St. Clair," however, was preoccupied when 

 used by Lane, because Dr. Penrose, Jr., in 1891 gave it to a 

 Silurian limestone in northern Arkansas,^ and therefore Lane 

 has renamed the St. Clair the "Antrim shales. "3 In 1874 Mr. 

 William W. Borden named the black shale in southern Indiana 

 the "New Albany black slate i"'^ but it is considered that this 

 represents more nearly the thinned westward extension of the 

 Ohio shale, after crossing Kentucky, than Newberry's Huron 

 shale. Outcrops of the New Albany shale have been described 

 by Dr. Kindle in the Wabash River region of northern Indiana 

 to the westward of Logansport.s 



It does not appear to the writer that the term " Huron shale" 

 of Newberry can stand as the name of this formation, for, as 

 Dr. Orton has said in discussing the name, "it would have served 

 the interest of geological classification much better to have 

 replaced the term altogether than to have restricted it to a small 

 fraction of what it was originally made to cover." ^ Neither does 

 it appear that either of the other names is applicable for this 

 shale. On a recent trip to the Huron River, however, the writer 

 found that the shale banks above and below Monroeville were 

 composed mainly of an upper black shale, apparently the Cleve- 

 land, below which are blue and olive shales alternating with black 

 ones ; this lower division probably representing part of the 

 Chagrin formation. Apparently only the upper part, if any, of 



'Letter of April 20, 1903. 



= Geol. Surv. Ark., Ann. Rept., 1890, Vol. I (July, 1 891), p. 124. 



'i Michigan Miner, September i, 1901, p. 9; Rept. State Board Geol. Surv. Mich. 

 for igoi, 1Q02, pp. 66, 209, footnote 48 ; and Russell in U. S. Geol. Surv., Twenty- 

 second Ann. Rept., Part III, 1902, PI. XLIV, p. 668. 



^ Geol. Surv. Ind., Fifth Ann. Rept., p. 158. 



sind. Dept. Geol. and Nat. Res., Twettty-fifth Ann. Rept., 1901, pp. 562-65. 



^ Rept. Geol. Surv. Ohio, Vol. VI (1888), p. 24. 



