CORRELATION TABLE OF THE QRAPTOLITE ZONES OF NEW YORK 1 



Clinton beds 



Cambric ' 



Richmond beds? 

 Lorraine beds 

 Frankfort shale 

 Utica shale 



Upper Trenton 



Middle Trenton 



Lower Trenton 



Black River limestone 

 and Lowville lime- 

 stone 



Chazy limestone 



Beekmantown lime- 

 stone 



Schaghticoke shale 



CRAPTOL1TE ZONES IN NEW YORK 



Z. of Monogr. clintonensis and R e t i o 1. 

 geinitzianus var. venosus 



Z. of D i p 1 o g. p e o s t a and D. f o 1 i a c e u s 



mut. vespertinus 

 Z. of Glossog. quadrimucronatus mut. 



posterus 

 Z. of Glossog. quadrimucronatus and 



Climacog. typicalis 



Subzone of Climacog. caudatus and 

 Corynoides curtus mut. comma 



Z. of Diplog. amplexicaulis (Upper 

 Dicellograptus zone) 



Z. of Nemag. gracilis (Normanskill shale) 



Z. of Diplog. dentatus and Cryptog. 



antennarius (Third Deep kill zone) 

 Subzone (transitional zone) with Did. for- 



c i p i f o r m i s (Ash hill quarry) 

 Z. of Didymog. bifidus and Phyllcg. 



anna 



Z. of Tetragraptus 

 subz. b of Goniog. 

 subz. a of Clonog. 



Z. of Dictyonema flabelliforme 



DISTRIBUTION IN NORTH AMERICA 



Z. of Dicellog. complanatus in Indian 



Territory 

 Wisconsin, Minnesota 



Ohio, Canada 



Canada, "Vermont, Pennsylvania, Ohio, Wis- 

 consin and Minn. (Maquoketa shale and part 

 of Galena ?) 



Canada (Magog, Cove Fields, etc.) 



Canada, New Jersey, Alabama, Arkansas, Indian 

 Territory, Nevada, British Columbia 



Canada (Point Levis zone), Arkansas, Nevada 



Canada (St Anne zone), Newfoundland 

 Canada (Main Point Levis zone) 



CORRESPONDING ZONES IN GREAT 

 BRITAIN AND SCANDINAVIA 



EXTRA-AMERICAN DISTRIBUTION 



Z. of Cyrtog. murchisoni 



Z. of Dicellog. complanatus 



Z. of P 1 e u r o g. linearis 



Z. of Dicranog. clingani 

 Z. of Nemag. gracilis 

 Z. of Didymog. geminus 



Great Britain, France, Belgium, 

 Scandinavia, Bohemia 



Z. of Didymog. bifidus and 

 Phyllog. typus (Upper Tet- 

 rag. zone) 



Z. of Tetragraptus (Lower Tetrag. 

 and Dichog. zones) 



Canada (Gaspe, St John) 



Z. of Dictyonema flabelli 

 forme 



Great Britain, Scandinavia 



Great Britain, Scandinavia 



Great Britain, Scandinavia 



Great Britain, Scandinavia, 

 France ? New South Wales 

 and Victoria 



Great Britain, Scandinavia 



Great Britain, Scandinavia, 

 France, Bohemia, Victoria 



Great Britain, Scandinavia, 

 France, Victoria 



Great Britain, Scandinavia, 

 Esthonia, Belgium 



1 This in part replaces the correlation table in Memoir 7 [facing p. 490]. . .. , , , ,. 



•It is still a mooted question whether the shale of Dictyonema flabelliforme constitutes the last horizon of the Cambric or the first of the Champlainic (Lower Siluric) and several authors have lately inclined to the 



