XV111. 



TABLE B. 



SUB-D1 VISIONS OF THE NEW YORK DEVONIC. 



TIME SCALE. 



FORMATION SCALE. 



DEVONIC ERA. DEVOXIC SERIES. 



c. Neodevonian period c. Chemung group. 



2. Disjunctus epoch 2. Chemung stage. 



(2). Chemung sandstones and shales. 

 (1). Portage sandstone. 



1. Intamescens epoch 1. Genesee stage. 



(3). Xaples shales. 



(2). Genesee shales, including Stylio- 



lina limestone. 

 (1). Tully limestone. 



b. Mesodevonian period h. Hamilton group. 



2. Spiriferoides epoch 2. Hamilton stage. 



(3). Upper or Moscow shales. 



(2). Encrinal limestone. 



(1). Lower or Hamilton shales. 



1. Minuta epoch 1. Marcellus stage. 



( ! ). Marcellus shales. 



a. Bodevonian period a. Upper HtMerberg group. 



3. Acuminatus epoch 3. Cornifcrons stage. 



(2). Corniferons limestone. 

 (1). Onondaga limestone. 



2. CaudagaUi epoch 2. Schoharie stage. 



(1). Schoharie grit and Esopus shales. 



1. Hipparionvx epoch 1. Oriskanv stage. 



(1). Oriskanv sandstone. 



The name "Disjunctus epoch" (H. S. Williams) is derived 

 from the characteristic fossil Spirifer disjunctus, while the 

 name "Intumescens epoch" is derived from the characteristic 

 fossil Goniatites intumescens." "Spiriferoides epoch" and 

 "Minuta epoch " are derived from the fossils Athvris spirifer- 

 oides and Orbiculoidea minuta, which are practically con- 

 fined to their respective epochs. The names are of limited 

 applicability .+ In the Eodevonian period, the name "Acumi- 

 natus epoch" is used for the last epoch, it being derived from 

 the characteristic fossil Spirifer acuminatus Conrad. This 

 species is represented by S. cultrijugatus F. Roemer, in the 

 upper (Coblenzian) part of the Rhenan or Lower Devonian 



•SeeJ. M. Clarke, [ntnmescens fauna, Am. Geol., Vol. VIII., p. 86 et *eci. 

 ; See note page x vi. 



