8 The Mountaineer 
To the geologist Adams is of prime interest. It stands as 
a great voleano in a sea of vuleanism. The volcanic fires at 
its base have been lighted so often that a great cone has been 
built up which has been but httle ravaged by time. The cone 
is compound in charaeter and the later eruptions have not 
occurred from the top but from openings upon different sides 
of the mountain. One of the last outbreaks took place on 
the south side of the cone within about 4000 feet of the top. 
A great flow, or series of flows, of lava poured out here, making 
a distinet shoulder to the mountain. The surface of this lava 
is black, ropy, fresh-looking, and with virtually no soil upon 
it. It extends down into the forest where it is covered with 
a very scant and stunted tree growth, with little or no under- 
brush. 
Looking south and west from Adams one sees a number 
of neighboring cones, usually low and tree-covered. They may 
be connected by under-ground pipes or conduits with the eiant 
that stands beside them, or they may all have independent 
roots reachine down to the molten magma below the earth’s 
erust. There are four or five low cones nearly in a row which 
extend from the south side of Adams toward the Columbia 
River. Another more prominent cone, with characteristic out- 
lines, 1s located about five miles west of Guler. Altogether it 
is an interesting field for the student of vuleanism, and one 
worthy of serious study. 
The eruptions from Adams have produced both lavas and 
pyroclasties, the former greatly predominating. The lavas 
have been mostly basalt, with a minor quantity of andesite. 
The pyroelastics represent ashes, cinders, pumice, and bombs 
that have been produced as the result of violent explosions. 
The lavas have been outpoured usually in great quantities so 
that to-day they are partly crystalline or porphyritie in their 
character. The basalt is black in color and as a rule compact 
and free from steam holes. The andesite is gray in color, fine 
grained, and prone to break up in broad thin slabs. No well- 
defined or marked craters are noted on the top of Adams, 
unless perchance they are to-day filled with snow. It is not 
likely that any except possibly a small crater or two would be 
exposed if the snows of the two prominent snow-fields at the 
summit should waste away. 
