LOWER PALEOZOIC. 
213 
And under Taconio 
TACONIC. 
Faunal (systemic) 
designations. 
Eock masses of New York and New England. 
Stratigraphic designations. 
C 
S 
u 
O 
o 
_a 
1 
'S 
o 
1 
■ s 
Lower portion of the Calciferous sandrock of New 
York. 
The St. Croix beds (so-called western Potsdam) of the 
Mississippi valley. 
St. Croix. 
Taconic. 
The Georgia group. 
The Taconic black slate and granular quartz. 
Acadian. 
Paradoxides beds of Braintree, Mass., and St. John's 
Group of New Brunswick. 
All other designations and localities as given by Mr. W<dcott. 
The faunal designations corresponding to these should be taken 
from the dominant types of life which they embrace, or from the 
sub-group which gives character to the group. The faunas here 
represented are nearly those defined and named by Barrande, 3d, 
2d and 1st faunas, and at present these terms might be employed, 
were it not apparent that they may by and by become inappro- 
priate owing to the discovery of faunas that preceded the " first 
fauna." 
Hence your reporter suggests the following : 
The Silurian group characterized by the 3d fauna. 
The Cambrian group characterized by the Cambrian or 2d 
fauna, with sub-faunas to be determined. 
The Taconic group to be characterized by the 1st or Primor- 
dial fauna, with the sub-groups 
St. Croix. 
Taconic. 
Acadian. 
This can be seen in the followino- condensed table: 
