90 
ALASKAN MINERAL RESOURCES IN 1906. 
when these papers were written. A final report on the geology and 
mineral resources of the region is now in preparation. The present] 
paper contains an abstract of such parts of that report as relate to 
petroleum. 
The general stratigraphic sequence in this region is represented in 
the following table: 
Generalized section of rocks in the Controller Bay region. 
Age. 
Character of beds. 
Thickness. 
Quaternary 
(Fluviatile, glacial, and beach deposits 
Feet. 
0-500+ 
(0 
12,000+ 
Paleozoic or Mesozoic (?) ... 
Slate and graywaeke with interbedded or intrusive green- 
stone and other igneous rocks. 
The oldest rocks of the region are the slates and graywackes, with 
associated igneous rocks, which make up the mass of Ragged Moun- 
tain and the low hills west of it and constitute all but the southeastern 
extremity of Wingham Island. The observed contacts of these rocks 
with the Tertiary rocks are faults. The amount of metamorphism 
which these rocks have undergone as compared with the Tertiary 
rocks, which though in direct contact with them are entirely unmetaj 
morphosed, proves a much greater age for the former and a great 
unconformity between them and the Tertiary rocks. The lithologic 
similarity of these older rocks to the Paleozoic or very early Mesozoic 
rocks at Yakutat, Orca, and Kodiak is suggestive of a corresponding 
age. 
The Tertiary sediments consist of monotonous repetitions of shales 
and sandstones, with an included mass of coal-bearing arkose, and one 
or more massive conglomerates. The total thickness; as stated in the 
foregoing table, is at least 12,000 feet. The structure of the region in 
which these rocks outcrop is complex, exposures are wanting at many 
critical points, and neither the lithologic character of the beds nor 
the fossils which they contain are sufficiently distinctive to make 
it possible to recognize with certainty the complete stratigraphic 
succession. 
The presence of two easily recognized kinds of rock, the arkose 
and the conglomerate, gives distinctive character to two parts of the 
stratigraphic column. The arkose is restricted in areal distribution 
to the region north of Bering Lake, and the conglomerate to the region 
south of the lake. Between these regions are areas of no outcrops, 
and none of the beds of either region can be recognized with certainty 
in the other. The following sections represent the rocks north and 
south of the lake; 
