Editorial Com.'ment. 49 
uniformity anrl entirety in one formation, of all the sandstones, 
traps, and amygdaloids of the Keweenaw peninsula. If it be 
horizontal it may be a part of the eastern sandstones, unconform- 
able on the trap rocks, and would be almost confirmatory of the 
idea of the younger date of the eastern sandstones. 
Nearly two miles still further southeast is Hinigarian river. 
At this place, again, the same combination of circumstances con- 
spires with the evident interpretation, and gives a very strong 
impression that the eastern sandstones run conformably below 
the tilted beds of the Cupriferous series. This is the natural and 
most ready interpretation of the facts, if the interpretation be 
based solely on the evidences here apparent, Messrs. Irving 
and Chamberlin again claim that the appearances are illusory. 
They made thorough examination, with the aid of a force of 
miners, digging several trenches which uncovered the beds that 
were supposed to form the contact plane of the two formations. 
In every case they found the eastern sandstone passing north- 
westwardly below the trap and amygdaloid of the copper-bear- 
ing series; but they found evidence that convinced them that it 
w^as not conformable to the overlying rocks. Following is the 
section exposed by the trenches, in descending order. 
Section on the Hungarian river. 
1. Broken trap essentially in place 10 ft. 
2. Trap debris: This follows the other without any definite 
demarkation or discernible amygdaloid. It seems to be 
formed of disintegrated trap rubbed into a lumpy clay and 
roughly laminated. It inclines northwesterly at an angle 
of about 35 ° I ft. 6 in 
3. Red shaly clay: This is a fine textured clay, much re- 
sembling what is known as joint cla}'. It is marked with 
light grayish-green spots, and has some sandy seams, with 
occasional lumps of trap. It is only in these latter partic- 
ulars that it differs from a true joint clay 6 in 
4. Trap debris, similar to that above described, except that it 
is more mingled with non-trappean (shaly) material. It is 
dark colored, and so contrasts with the adjoining red clay. 6 in 
5. Mixed shaly trap debris and red clay, with a minor ele- 
ment of sand ; the whole of a reddish cast Sin 
6. Light reddish-tinted quartzose sandstone, exposed about. . 2 ft. 
"On the immediate face of this sandstone (No. 6) at its 
junction with the trap debris above it, the structure planes — 
