FOSTER AND WHITNEY ON THE EASTERN SANDSTONE. 361 
ded, showing in a south-facing cliff 60 feet high and 350 feet long. It is 
reddish, very coarse, and composed almost entirely of rounded grains of 
quartz. One hundred paces from the foot of this cliff are reddish decom- 
posed schists trending N. E. and dipping 45° to 60° 8. E. Seven hundred 
paces northeast, near the southeast corner of section 11, is a small ledge of a 
dark-brown, weathered, medium-grained diabase, and in the northeast part 
of the same section, and running thence through sections 10 and 9, and 
terminating in the S. E. 4 of Sec. 5, is a series of exposures of diabase 
pseud-amygdaloid and amygdaloid. Further west and again east of the 
sandstone are other exposures of amygdaloid, so that there can be no ques- 
tion whatever that the Eastern Sandstone lies directly across the course 
of the Keweenawan belt. 
Four different views have been held, since the publication of the well- 
known report of Foster and Whitney, as to the relations of the Eastern 
Sandstone to the northward-dipping rocks against which it abuts. 
Foster and Whitney’s idea! evidently was that the Eastern Sandstone 
and that which, with a very great thickness, forms the west side of Ke- 
weenaw Point, were originally the same, but are separated by a longitu- 
dinal fault extending from Béte Grise to Black River. In the region of 
Béte Grise this fault was supposed to be accompanied by the protrusion of 
the mass of the Bohemian Range, to whose elevation was attributed the 
northward inclination of the whole succession of “bedded traps,” with the 
overlying conglomerates and sandstones, which constitute the greater part 
of Keweenaw Point, and the inclination southward of the Eastern Sand- 
stone in the Béte Grise region, the Bohemian Range being taken as the 
center of an anticlinal. Farther west this fissure was supposed to have 
been unaccompanied by any outflow, and the Eastern Sandstone to have 
been left horizontal. 
I have shown on a previous page that the rocks of the Bohemian Range 
are simply a downward continuation of the Keweenaw Point Series, being 
made up of the usual flows, and that there is no evidence of anticlinal struc- 
ture. Otherwise the theory of Foster and Whitney has some plausibility in 
it. Ihave myself already argued in favor of the view that the southern 
escarpment of the Keweenaw Range is a fault line, though with different 
1 Report on the Lake Superior Land District, Part I, p. 66. 
