NOMENCLA TURK OF THE OHIO FORMA TIONS 5 3 3 



the Catskill in the Carboniferous or not, but the 7-ed Bedford and the over- 

 lying Berea with its shale above (red at the east) are certainly of Catskill 

 age.' 



14. David Dale Owen in giving a summary of the geology 

 of Indiana, after stating that the soft freestone knobs of that 

 state were equivalent to the Waverly rock of Ohio, said: "The 

 black slate in the base of these knobs is the equivalent of the 

 Scioto slates and shales."^ In the above reference Dr. Owen 

 undoubtedly referred to the shales which were later named the 

 Ohio by Andrews ; but it is thought that this casual use of the 

 term "Scioto slates and shales" ought not to replace the definite 

 one of Andrews, which is now a well-known name in geological 

 literature. 



In 1877 Professor Shaler, evidently unaware that Professor 

 Andrews had named the Black shale of southern Ohio the "Ohio 

 black slate," proposed as a new name for this formation "Ohio 

 shale. "3 



In northern Ohio, equivalent to the "Ohio shale" of southern 

 and central Ohio, are three formations, the lower and upper ones 

 composed mainly of black shale and called the " Huron and 

 Cleveland shales," separated b}^ a mass of grayish shales, and 

 thin sandstones now called the Chagrin formation. 



15. This formation was named the "Erie shale" by Newberry 

 in 1870, but it was preoccupied. Vanuxem in 1842 named one 

 of the divisions of the New York system, the "Erie," which was 

 composed of the formations ranging from the Marcellus shale to 

 the Chemung inclusive; while Logan in 1863 named one of the 

 Quaternary formations of Ontario the "Erie clay."'* Finally, 

 the name "Girard" shale, applied by Dr. I. C.White in 188 1 to 

 a mass of Devonian shales in Erie county in northwestern Penn- 

 sylvania, ^ is only equivalent to a portion of Newberry's Erie 

 shale. 



The name Chagrin formatio?i is, therefore, proposed for this 

 ' Letter of April 2, 1903. 



" Cont. Geol. Rec. of the State of Indiana, 1838, Part II, 1859, p. 59. 

 3 Geol. Surv. Ky., Rept. Prog., Vol. Ill, N. S., p. 169. 

 "• Geol. Surv. Canada, Rept. Prog, from Com. to 1863, pp. 896, 897. 

 ^Second Geol. Surv. Pa., Q^, pp. 117, 118. 



