PHYSICAL ASPECT OF CAMBRIAN ROCKS IN EASTERN Ci\.NADA. 259 * 
C I. — The Acadian Division, has two faunas. 
C. la. — A white-gray quartzite (no fossils). 
C. lb. — Greenish gray shales and sandstones (Protolenus Fauna). 
C. I Cl. — Gray shales (Paradoxides lamellatus sub-fauna). 
C. I C2 . — Gray shales (P. eteminicus sub- fauna). 
C. id. — Dark gray shales (P. ahenacus sub-fauna). 
C. I d2. — Dark gray shales and limestone lentiles (Dorypyge sub-fauna). 
C. 2. — Johannian Division, has one or more faunas. 
C. 2a & b. — Gray quartzites, flags and slates (Upper Paradoxides Fauna). 
C. 2C. — Gray flags and slates (Place of Olenus Fauna). 
C. 3. — Bretonian Division, has four faunas. 
C. 3a. — Dark gray slates, some flags (Parabolina Fauna). 
C. 3b. — Dark gray slates, limestone lentiles and seams (Peltura Fauna). 
C. 3c. — Dark gray and black slates (Dictyonema Fauna). 
C. 3d. — Dark gray and black slates (Tetragraptus Fauna). 
C. 3e . — Gray flaggy sandstones (Fauna of small brachiopods, not dis- 
tinctive) . 
It should be explained that the relative position of one of these ' 
assises is determined by the palaeontology and not supported by 
the stratigraphy. In the St. John basin (R3 of the locality Column). 
Paradoxides aberiaais is clearly subordinate to ( underlies ) P. 
eteminicus. But in Sweden the position of the representative 
species is reversed, for P.Tessini there is below P. exsulens. In 
the Kennebecasis basin (B2) at Hastings’ Cove, the P . eteininiciis 
fauna is wanting and the P. ahenacus rests on an assise having a 
peculiar grouping of species ( Dorypyge sub-fauna ), which con-- 
tains genera of a higher range in Sweden and North America than 
P. T essini and P. ahenacus. . The latter form of trilobite is usually 
found in dark gray or black shales, and it seems likely that habitat 
has much to do with its perplexing relation to other species and 
genera. It lived in deep and quiet waters, while the exsulens- 
eteminicus type preferred shallower water in which species with 
calcareous tests and shells were common. , 
The Dorypyge sub-fauna, also preferred shore or shallow- 
water conditions. These prevailed on the border of the Kenne- 
bacasis basin ( B2 ) until a sinking of the land brought in a 
purely P. abenactis fauna. This fauna is included under the sym - 
bol of Cid2 given above, while Cid is the P. ahenacus fauna of 
the St. John basin. 
Another fauna of doubtful position is that marked C3e, which 
is placed as the highest fauna, because both at the east and west 
end of the St. John basin it is in the highest visible beds of the St. 
John terrane ; hence it is thought that this fauna is of later origin 1 
than the others. 
