Winchell.] ^io [May 6, 



IX. The Name. 

 Should the equivalencies of the rocks under consideration be finally 

 adjusted in the manner which I have indicated, it will be important to 

 select a designation for the group in accordance with the recognized can- 

 ons of geological nomenclature. In that case, it will scarcely be permis- 

 sible to employ the term " Catskill Group, " since the principal mass of 

 the rocks which are made the type of that group is now known to belong 

 to the Chemung; and the name would be a misnomer. A similar objec- 

 tion rests against the use of the term "Waverly." This term, as I have 

 already intimated, has been used in different senses; and by all parties, 

 from Professor Briggs down, has been employed to embrace, at least in 

 central and southern Ohio (the typical region), either the entire series of 

 strata between the Conglomerate and the "Black Shale," or, at least, the 

 lower portion of that series. It is necessary to apply a term to the exclu- 

 sion of the "Chocolate Series" of Ohio, underlying the fossiliferous sand- 

 stones of the Waverly series. The first geographical designation which 

 was employed in this restricted sense was " Marshall Group," first em- 

 ployed and published by me in December, 1860, and afterwards introduced 

 in my Geological Repoi't, advance copies of which were distributed in 

 August, 1861. 



APPENDIX. 



References to Pxjblicatioks on the Geology of the Rocks under 

 Consideration. 



1836. Hildreth : Amer. Jour. Sci. and Arts, xxix., pp. 133, 136; PI. 1, 

 26, 28. 



1838. Houghton: First Ann. Rep. Geol. Surv. Mich., p. 3. 

 " Briggs: First Ann. Rep. Geol. Surv. Ohio, p. 79. 



" Foster: Second Ann. Rep. Geol. Surv. Ohio, p. 105. 



1839. Houghton: Second Ann. Rep. Geol. Surv. Mich., p. 28. 



1840. Hubbard: Mich. Geol. Rep., p. 87. 



1841. Hubbard: Mich. Geol. Rep., p. 132, &c. 



1842. Hall: Am. Jour. Sci. and Arts, xlii., p. 51. 

 " Hall: Jour. Bos. Soc. Nat. Hist., v., p. 1. 



" Conrad: Jour. Acad. Nat. Sci., Phil.; viii., 249. 

 " Hall: Trans. Assoc. Amer. Geol., p. 269. 

 " Vanuxem: Final Rep. Geol. N. Y. Hid Dist. 



1843. Hall: Final Rep. IVth Dist. N. Y. 



1846. Hall: Paleont. N. Y., vol. I., Introd., p. 16. 



1847. Yandell and Shumard: Contributions to the Geology of Ky., p. 16. 

 " De Verneuil: Bull. Soc. Geol. France, ser. II., Tomeiv, p. 648 (Am. 



Jour. Sci. [2] v., 176, 350; and vii. 45, 218.) 



1848. Sharpe: Quar. Jour. Geol. Soc. Lond., vol. iv , 151. 

 1848-9. Murray: Canad. Geol. Rep., p. 24. 



