ANTICOSTI ISLAND FAUNAS. 
3 
miles separates the two outcrops. The number of such species 
is quite large and will be given in the final work. These faunal 
differences of the two shores leads to the conclusion that the fau- 
nas of the Anticosti seas were at least partly controlled by the 
depth of water and the character of the sediments. There is 
nothing new or strange in this conclusion since similar conditions 
always obtain in the case of modern waters. The fact, however, 
has great importance in correlation; but by many writers it 
appears to have been almost wholly ignored and differences of 
fauna have been explained in other ways. Exhaustive treatment 
of this phase of the stratigraphy is ultimately contemplated, 
Anticosti island consists of a part of a cuesta on an ancient 
coastal plain which probably began to develop in the Devonian 
and existed until the time of the post-glacial submergence. It 
will be called the Anticosti cuesta. About twenty miles to the 
north the Mingan islands fringe the Quebec shore and consist of 
the remnants of a parallel cuesta. This will be named the Mingan 
cuesta. Between the two cuestas lay an inner lowland which 
near the west end of Anticosti was crossed by a north-south 
divide from which streams drained east and west, the former 
being the longer. North of the Mingan cuesta is another low- 
land. The latter will be called the Laurentide lowland and the 
former the Channel lowland. 
