18 PETROLEUM OF PACIFIC COAST OF ALASKA. I bull. 250. 
the high southern peak of this ridge is an unexplained irregularity, 
for the strike is N. 30° W., with a dip of 35° SW. From this point a 
ridge extends northeastward along the eastern side of the Katalla 
Valley. The strike and dip last mentioned are apparently confined 
to the southern peak of this ridge, for be} T ond the first saddle which 
separates it from the continuation of the ridge the strike is along the 
crest of the ridge, N. 40° E., with a dip of 35° SE. (See PL III.) 
This ridge is, then, apparently monoclinal, with the exception of its 
southwestern peak, where the strata have been abruptly flexed or 
faulted, striking almost at right angles to those in the rest of the 
ridge. 
The exposures on the western shore of Bering Lake show greater 
uniformity of strike than those hitherto described. The strike varies 
from N. 55° E. to N. 85° E., while the dip is from 18° to 65° NW. 
This strike if continued southwestward would carry the same strata 
and the same structure into the hills on the northwestern side of 
the Katalla Valley, and would thus make Katalla River occupy an 
anticlinal area with a northeast-southwest direction. This strike 
does not seem to continue northeastward across Bering Lake, for 
the strata on the north shore of the lake apparently belong to a dif- 
ferent formation and have a different structure. It is possible, then, 
that the northwestern arm of the lake occupies the position of a 
fault which extends north and south parallel to the western shore 
of the lake. If this fault is continued southward into the region of 
the hills on the western side of the Burls Creek Valley, it may 
explain some of the apparently strong variations in the structure 
within short distances, which have been alluded to above. 
In the valley of Burls Creek, however, a great complexity of struc- 
tural relations exists, almost no two outcrops agreeing, even in the 
general direction of the strike or dip. The outcrops nearest the shore 
of Bering Lake, on the western slope of the creek's valley, have a 
strike of N. 30° E. and a dip varying from 45° to G0° SE. This 
corresponds in general direction and amount with the strike and dip 
of the ridge forming the eastern slope of the Katalla Valley, and inas- 
much as this hill is in a general way the most northeasterly outlier of 
this ridge it is possible that it is a part of the same anticlinal fold. 
In a peak 1 mile to the south an approximate north-south strike 
was observed, with a dip of 45° to the west. This would seem to lie 
upon the eastern flank of a syncline whose axis corresponds in a gen- 
eral way with the position of the group of hills occupying the area 
between Redwood Creek and Man/ Creek. This syncline might be 
considered the northern prolongation of the one shown in the crescent- 
shaped ridge bordering the northern shore of Strawberry Harbor, 
The peninsula from Point Hey to Cave Point consists of a crescent- 
shaped ridge, its concave face toward the sea, and forming the north- 
