martin.] GEOLOGY OF CONTROLLER KAY REGION. 13 
appearance. The degree of metamorphism is slight, the alteration 
being apparently the effect of crushing and infiltration. None of the 
minerals show the effect of extensive recrystallization. 
The series is best exposed west of Katalla (see map, PL III) and 
along the neighboring shore of the Pacific, where the beds are steeply 
folded, dipping almost 90°, and are also somewhat crumpled. There 
are excellent exposures, too, on the Fox Islands, which are made up 
of this same series, and it was apparently again observed at the ex- 
treme southwest point of Wingham Island. Rocks of the same gen- 
eral appearance were also seen about 3^ miles north of Kishtak Point, 
in Lone Baldy Mountain, and in the valley north of that region. At 
the latter place petroleum was noticed in the joints. The high ranges 
to the north and northeast of this point are apparently composed of 
this formation, or of one very similar in character dipping at a high 
angle. 
There is no evidence of the age of these rocks, or of their relation 
to the others to be described, except that they are apparently older 
than all the latter. It is possible that they represent part of the Orca 
or Valdes series of the Copper River region. 
KATALLA FORMATION. 
The Katalla formation is a series of dark argillaceous and carbon- 
aceous shales, with occasional bands of sandstone, limestone, con- 
glomerate, and volcanic ash. It is the series through which the petro- 
leum of the region reaches the surface. The formation is typically 
exposed in the region to the northeast of Katalla, along the banks 
of Katalla River, and in the range of hills to the southeast. From 
this point it extends eastward, occupying the whole of the peninsula 
between Bering Lake and Controller Bay and outcropping in most of 
the hills south and east of Bering River. Good exposures were seen 
on the west shore of Bering Lake, and it is possible that some of the 
shales and sandstones of Kayak and Wingham islands represent the 
same formation. No estimate could be made of the thickness of 
the formation because of the complicated structure in all the districts 
where it is exposed. 
The few fossils that have been obtained indicate that the Katalla 
formation is of Tertiary age. Several specimens of a crab and frag- 
ments of a gastropod were collected on the west shore of Bering Lake. 
and fragments of a peJecypod were seen at the mouth of Bering 
River, and a fossiliferous limestone concretion with many fragment- 
ary pelecypods was collected in the bed of Chilkat Creek. These 
were submitted for determination to Dr. T. W. Stanton, who reports 
as follows: " The very small lots from the neighborhood of Bering 
Lake and Controller Bay are probably of Tertiary age. 1 ' The fol- 
Bull. 250—05 m 2 
