ROCKS NEAR THE MOUTH OF BAPTISM RIVER. 319 
fine-grained diabase and amygdaloid, which in turn pass, with a steep dip, 
underneath the quartz-porphyry of the bold point C. 
The rock of the latter point is precisely the same as that of the Pali- 
sades. It shows the same violet-tinted base, the same quartzes with glass 
inclusions, the same very abundant orthoclases, the same strongly columnar 
structure, and the same lamination. Here, however, the lamination shows 
much less tendency to confine itself to one direction, and therefore is less 
likely to be mistaken for sedimentary lamination. The point as a whole 
shows a very distinct dip to the eastward, and yet on the long face C D, 
parallel to the trend, where the laminze should look horizontal, were the rock 
a sedimentary one, they wander up and down in a wholly aimless manner. 
At the point D, where this rock ends on a small beach, its lamine dip 60° 
S. 65° W., while just beyond across the beach they dip 80° north of east. 
Here the porphyry is highly charged with calcite, which has impregnated 
it in cross seams, and along the lamination, and in places there is a general 
calcitic decay, large white pseud-amygdules of calcite dotting the rock. At 
D F of the map of Fig. 23, this porphyry passes beneath plainly bedded 
diabases and amygdaloids. This horizon I have selected as the base of the 
Temperance River Group. 
The close similarity of the Palisade porphyry to that of the point just 
below Baptism River, and of the diabases immediately underlying these 
porphyries to one another, suggest that the two points are but portions of 
one layer faulted apart. 
Beyond the point last described, in descending the coast, the Beaver 
Bay Group strikes back into the country, having between it and the shore 
a constantly widening strip of the beds of the Temperance River Group. 
The exposures, by which has been made out the continuance, in this region, 
of the Beaver Bay Group, until it emerges again on the shore at Grand 
Marais, do not merit any particular description. They are the usual steep- 
backed ridges, with flat lakeward slope, composed of the common black 
gabbro. 
The exposures below Grand Marais which I have referred to the Bea- 
ver Bay Group may also be more rapidly passed over. The dips here are 
not more than 8° to 10° lakeward, and the trend much more to the east 
