180 Ulrich — Chattanoog an Series ir/'th Special Reference 



the Huron that a Devonian and perhaps Genesee age seemed 

 assured for the latter. 



Since reaching the conclusion that the Chagrin really be- 

 longs beneath and not above the Huron, I have searched the 

 literature and found but a single unqualified identification of 

 an unquestionably Devonian fish in a Chattanoogan formation, 

 namely, Dinichthys pustulosis Eastman. But this species is 

 said by Eastman* to range throughout the middle Devonian 

 of the Mississippi Valley as well as in the Oneonta beds of 

 New York and the Chattanooga shale in Kentucky. Very 

 likely the identification is at fault in the latter two cases. 

 Dinichthys curtus — a Cleveland shale species — is doubtfully 

 reported by Newberry from supposed Chemung beds in Penn- 

 sylvania. All other species referred to by Eastman in his 

 memoir on fossil fishes of New York as common to the Cleve- 

 land shale and the Devonian of New York have been identified 

 solely by means of fragmentary material, very possibly under 

 unconscious influence of preceding belief in the general con- 

 temporaneity of the beds. 



Fossil wood of the type of Dadoxylon newberryi occurs in 

 the Genesee of New York and has been identified specifically 

 with this Ohio shale fossil. But it would be no difficult matter 

 to fall into error in the identification of these fossil woods 

 when the preservation of the specimens is not unusually good. 

 Besides, a piece of wood that is externally at least very much 

 like Dadoxylon newberryi, though differing appreciably in 

 minute internal features whose importance I am not qualified 

 to judge, has been found in southwestern Missouri at the base 

 of the Fern Glen, which I regard as early Osagian in age. 

 Perhaps this specimen should be viewed as a bowlder from 

 nearby Chattanooga shale. Fairly good remains of plants 

 allied to Calamites also have been found in both the Huron 

 and the Genesee. Specific identity has been claimed for these, 

 but I am not satisfied that the case has been proved. Until 

 the specimens have been critically compared by a thoroughly 

 competent observer like Mr. David White, who is now 

 engaged on their study, I prefer to . remain silent respecting 

 the proper interpretation of the evidence afforded by these and 

 the other plants involved in our problem. 



Similarity of the Huron and Cleveland shale formations. 

 — The close and constantly growing agreement between the 

 faunas of the Huron and Cleveland shales in Ohio has recently 

 been emphasized by Kindle in his endeavor to prove the 

 Devonian age of the Cleveland. Obviously, in view of my 

 contention that these two shales are but members of a single 

 diastrophically determined stratigraphic unit, entirely subse- 

 * Eastman. C. E.: Memoir 10, New York State Mus., p. 133, 1907. 



