354 COPPER-BEARING ROCKS OF LAKE SUPERIOR. 
As already shown, the contact line of the sandstone and northward-dip- 
ping Keweenawan rocks west of Béte Grise Bay is plainly marked by a 
sharp break in the topography. At a number of points along this line, 
phenomena similar to those observed at Béte Grise have been noted—z. e., 
the sandstone inclining southward at an angle which lessens in amount very 
rapidly as one passes away from the contact. This may be seen, for in- 
stance, in the vicinity of Lac La Belle and Gratiot Lake, and on some of the 
head streams of Tobaeco River. As long since shown by Foster and Whit- 
ney, the amount of southward dip in the sandstone, even near the contact, 
lessens westward, so that, in the vicinity of Torch and Portage lakes, it lies 
horizontally at the contact, or, at most, inclines but a very few degrees 
southeastward. 
The contact line is crossed and exposed by several of the small streams 
entering Torch Lake on its west side. These streams run in quite deep 
gorges, which are carved in the Eastern Sandstone, and end abruptly, often 
with a vertical wall, where they reach the more enduring rocks of the Trap 
Range. The gorges of two of these streams, the Hungarian and Douglas 
Houghton rivers, were examined with some care. As the Hungarian River 
is ascended, the sandstone is first met with on the sides of the ravine, and 
then in its bed also, where it forms several falls. or the most part the sand- 
stone is light-colored and quartzose, but conglomerate bands are included 
in which the pebbles are in the main of some of the red acid eruptives 
of the Keweenawan. Often the sandstone lies horizontally; at times 
it appears to have a slight northwesterly dip, and as often a slight south- 
easterly one. These deviations from horizontality are often plainly the 
result of the undermining on the side of the ravine. At the uppermost fall 
the contact with the older rocks is seen. The occurrences here, and for 
some distance below, are as shown in the accompanying sketch made on 
the ground by Mr. W. M. Chauvenet, in which B is the bank of the gorge 
without exposures; A, sandstone layers projecting from the sides of the bank; 
D, amygdaloid and pseud-amygdaloid dipping northwesterly; EK, the con- 
tinuation of the amygdaloid in a crumbling condition; C, porphyry-con- 
glomerate; and F, an overlying diabase. At G, at the very foot of the fall, 
is a smoothed surface of sandstone jointed in two directions, the two joint 
