fi">6 NDW YORK STATE MUSEUM 



The Hainiltoii deposits of Micliipm, Wiscousin and Iowa, how- 

 ever, belonji: to a distinct subjuovince, and received their main 

 aecessions from another direction. 

 fnJltfJn We believe another Atlantic invasion of the eastern Mississip- 



pian sea occurred during early Portage time, introducing a good 

 part of the very characteristic Naples fauna, as Manticoceras, 

 Oephyroceras, Beloceras. Sandbergeroceras and Cyrtoclymenia. 

 The goniatite fauna of this formation, according to Dr Clarke's^ 

 work, consists of no less than eight genera and 25 species, and 

 yet in no other American area holding beds of similar age, occurs 

 more than one species of goniatite. (Manticoceras i n t u - 

 m e s c e n s , the widely dispersed European species, is also 

 found in Iowa and on Hay river, latitude G0° north.) This 

 fauna is closely related to that *S)f Martenberg in Westphalia."^ 

 IIow long this Atlantic invasion continued we ^o not pretend to 

 state, but it is certain that the indigenous Upper Devonic faunas 

 of New York not only receivcnl the above supposed Atlantic 

 migrants, but also some from Iowa, as in the High Point (N. Y.) 

 faunula. The Mackenzie basin Upper Devonic fauna, charac- 

 terized by S t r i n g o c e p h a 1 u s b u r t i n i , is of a distinct 

 subprovince; but the geographic d^n'ivation of that fauna we do 

 not yet know. ^Ye are however satisfied these Mackenzie 

 Devonic dejiosits had no direct connection with those of Iowa. 



Carbonic 2 



There ajipears to Ix' a complete series of Devonic deposits, 

 with the possible exception of the Onondaga, in the middle third 

 of the Ai)j)alachian Yalley trough, but early Mississippian seems 

 to be wanting in this portion. In the southern end, the early 

 <'arbonic, represented just west of the Rome barrier by the 

 Fort Payne chert, also was i)artially excluded; but the St Louis, 

 and possibly Chester, are rejiresented in the trough at several 

 jioints. The Fort Payne chert is represented within the extreme 



'Am. geol. IStH. p. SG-lon; N. Y. state gool. l.'tli an. rep't. 1808. 

 p. 31-81; also ib. lOth rep't. extract. 1898. p. .31-143. 

 'Clarke, p. 130. 

 ■For this 8tK?tlon Mr Ilrich alone is responsible. 



