66 
ALASKAN MINERAL RESOURCES IN 1905. 
Geologic formations in Controller Bay region. 
Age. 
Name of formation. 
Quaternary 
Tertiary 
1><> I Kushtaka formatu 
Do Katalla formation. 
Mesozoic or Paleozoic 
Lithologic character. 
Silts, sands, and clays 
Shale, with some sandstone 
Arkose, with coal beds and some 
shale and sandstone. 
Shale, sandstone, and conglomer- 
ate. 
slate, graywacke, and volcanic 
rocks. 
Thickness 
in feet. 
2,000+ 
3,500-4,000 
Areas underlain by coal 
■A 
Anthracite 
« 
Bituminous 
Z 
17 Sample locality. 
Numbers refer to 
numbering of samples 
in the text 
Scale 
6miles 
Fig. 2.— Map of Bering River coal field, showing areas underlain by coal. 
Section of upper part of Kushtaka (coal-bearing) formation on Kushtaka Ridge. 
Contact with overlying formation. 
Shale, coaly 
Shale 
Coal (shaly at bottom for I foot) 
Shale, dark, but weathering brownish red 
Coal 
Shale, with some coal 
Shale, blue, sandy 
Arkose 
Shale, dark 
Ft. in. 
2 
8 
3 8 
9 
l 9 
n 
(8 
2:n 
9 
