NOKTH AMERICAN PAL.EONTOLOaY. 285 



. u^MT^vS Devoaian Lamellibrancbiata and Species-mak- 



'^i::^!^::TZ^<^:^r.e., -l. xxxn, pp. I92-IO8, September, 



1886. NewNaveu.) L,,,eUibrancMata II, te.t and 



A criticism of -Palaeontology, vol. V, P^'*^'^ Dimvaria of the Upper 



plates. Containing descriptions ^-^^^^'^^^f^J^^.f^'^J ja^nes Hall, State 

 Helderberg, Hamilton, Portage, and Cliemung groups, by 

 Geologist, Albany, New York, I880. _ 



Notice of. See AtnericanJonrnal of Science, September. 



the Genesee shales up t^-^^^^^^^.^ ^^fout^a^ disappear at the eastern 

 and possibly higher. Th-;f ^^^^^ ^^,^3 ,,d their fauna (C) are corn- 

 extreme of the area. (2) The Porta o ^_^. ^.^ 

 paratively local, belonging to the cent al^^^^^^^ 



in the more western sections and both ^^^^^^^ '-^^^3! It is evident from the 

 are unrecognizable east ^^ ^he Cayuga secuou ^) ^^ ^^^^.^^ 



study of the sections that the '"t.rs^l occupie^l i^ t ^^ ^^_ 



the typical Portage fauna is ^;f «^«°*^;y '.^^^^^^^^ ,vhile still farther 

 tirely different set of ^^^f^^^^l^^^nt^.^ is filled by a 

 east in the ^benango and Un^^d la .e tio ^^^^^^^^^ ^....p.^ the State 

 preliminary stage of the Cat.k 11 U^ 1 ^ ^ ^^^^^^ ^^ ^^ .^ ^^^ ^^^. 



reports contains faunas (A., 3, ^).:^^"^;^^^ '^ . ^^ ^f f^^^as differs from 

 cessive modifications of the Hamilton fauna JJ^-^^^ ^^^^ ^^^^^,,^^t 



the Chemung fauna in the -^--:;f,re;idence f^^^^^^ stages in modifi- 

 epecies, and by presenting unmistakable «vKlenc ^^^ ^^^^ 



Itionofspecieswhicha.^^^^^^ 



Bpecific name. (5) The ^^^^s 01 m » ^^^ ^^^.^^ Thelowest 



l_7)i8Confinedtothesectiouseastof thoCananda ^^^^^^ ^^^^ ^^^ 



stage (A. 1) occurs at the -7;"^^^ ^J,^, ^d Thethi'xl^^^^ 

 hlackGeneseeshalearescarcelytobe ecogni ea^ 



do not appear at the extreme east, ^ ^^^ ^ ^^^ \-^ ^,,, ,t,ge of the 

 sections, their place farther east ^^""^^ ^^^f^^^^/^^stern and fail in the 

 CatskiU. The following stages ^^n-- - Jhc more ea ^^^^^^^ ^^^^^^ 



Cayuga section while^^^^^^^^^^^ 



and appears after the cueimu.fet.^^^^^^^ 



region. (6) The CatskiU deposits of <;^;"^°g7 .^^ J tl,, CatskiU, but 

 trfusically not ^^-^-g^;^^^^^ ? fi^r.^h c^ interval occupied by 



appear at a lower ^o^^^^ ^^^^^l^-, , ,,, ..iddle part of the 

 the " Ithaca group " of the Caj »5^'^^^^'^ pahentologically they are im- 

 port age group of the ^--'^'''^^^^^^^,, and ai-e followed by 

 mediately preceded by stages o ^^^^ ^^H;"" i^ThrChemung fauna appears, 

 laterstagesof the same general fauna ( ) i ^ sections (D. 



ia what I consider its earliest ^^-^^S-al s^ag^^^^^^^^^^^ ^^ ^^^ ^,^. 



and D. 1), but the predominant -^^'^^f^^^'^^^^^^^^ sections (D. 4 of 



nuing appear stratigraphicay e lest - ^^-^ ^ ,^ ,,, ,p,er pa.t 



Girard and Cbatauqua)^ 1 us^sta e o t ^^^^^ ^^^^^^ ^^ ^^^^^ 



t^::^:::^^:^^^^^ Chenango ..l nnadma actions) thia 



