56 
THE NEW YORK SERIES. 
ERA OR SYSTEM. PERIOD OR GROUP. AGE OR STAGE. 
Georgian Georgia slates 
Cambric 
or Acadian 
Taconic 
Potsdamian Potsdam sandstone and limestone 
Canadian (3) J Beekmantown limestone (15) 
(Paleochamplainic) | Chazy limestone 
Mohawkian (4) {Black i limestone (16) 
(Lower Silurian (Mesochamplainic) Black river limestone 
and Ordovician) Trenton limestone 
Utica shale 
Lorraine beds (17) 
Richmond beds (Ohio, Indiana) 
Cincinnatian (5) 
(Neochamplainic) 
Champlainic (1) 
: Shawangunk grit 
(Paleontaric) Medina sandstone 
a Clinton beds 
Ontaric (2) Niagaran (7) Rochester shale 
i (6) fee conglomerate 
or . : 
Siluric (Mesontaric) Gettin do oo 
Salina beds 
fear Rondout waterlime (18) 
Manlius limestone (19) 
9 Coeymans limestone (20) 
= - New Scotland beds (21) 
- Helderbergain (9) Becraft limestone (22) 
= Kingston beds (23) 
fe) 
. < Oriskanian (10) Oriskany beds 
Qu 
Y { Esopus grit (24) 
5 Ulsterian (11) Schoharie grit 
Fs (Onondaga limestone 
a=) 
9 : f Marcellus shale 
Devonic £ Erian (12) \ Hamilton beds 
Portage beds 
Senecan (13) (Naples beds, 
Ithaca beds, 
Oneonta beds, 
local facies) 
Neodevonic 
Chemung beds 
Chautauquan (14) (Catskill sandstone, (25) 
Tully limestone 
Genesee shale 
local facies ) 
