Cambrian Rocks in Acadia. pe 7(o) 
AFFINITIES OF THE CHARACTERISTIC GENERA OF THE 
GEORGIAN FAUNA. 
Cambrian in Stages of the 
Europe, prin- Acadian 
cipal part. Series. 
4. Ceratopyge Orthisina affinities, with species above 4. 
limestone and} Bathyuriscus 
shale Nenafidone affinities with genera in 4 
2 ae, and above. 
Protypus 
3. Upper Ole-| Bathynotus affinities with genera in 3 and 
b Stage 3. 
nus beds. apove. 
Dorypyge affinities with genera in 3 and 4. 
hea Ole- Ptychoparia ‘ ** “species in 3 and 4. 
a “c “ * Stage 5 
wine (Pee Agnostus in 38. 
‘ Olenoides “genera in 3. 
Microdiseus ‘‘ ‘* “species in 1. 
1. Paradoxides|} Qjenelus  “! “genera in 1 Stage 1 
beds. Mesonacis “ “* genera in 1. 
A further point for consideration, seeing that the Geor- 
gian Series, by its fauna, is for the most part younger than 
the Acadian, is as to whether it overlaps the latter ; that is, 
whether the Georgian epoch was cotemporary with the 
closing part of the Acadian. The majority of the 
trilobites of the Georgian may be said to compare 
with those which in Europe, mark the upper part 
of the Olenus Zone and the Ceratopyge beds; but this is by 
resembling genera only, while we know Stage 3 of the Aca- 
dixn Serie~ to be equivalent to the upper part of the Olenus 
Zone by identical genera, and even by identical species. 
The upper part of the Acadian would, therefore, be near the 
Georgian in time; but whether it is cotemporary with 
the latter or not, can only be established by an examin- 
ation of the region where they come together, namely, in 
Cape Breton and Newfoundland, In the former island they 
are separated only by a low, narrow range of pre-Cambrian 
hills, and in Newfoundland, according to Mr. Walcott, they 
a 
