Geologic Studies in Alaska by the U.S. Geological Survey, 1992

92 GEOLOGIC STUDIES IN ALASKA BY THE U.S. GEOLOGICAL SURVEY, 1992
the largest found to the south around Cairn Mountain
(1,158 m) and to the north in the Lyman Hills, with eleva-
tions above 1,200 m.
GEOLOGY
The geology of the western half of the Lime Hills
quadrangle has not been studied in detail. Descriptions
and lithotectonic terrane designations used here are taken
largely from Wallace and others (1989) and from Jones
EXPLANATION
X mine
x prospect
Polymetalllc Lodes
3 Candle Creek
4 Beaver Mountains
5 Broken Shovel
8 Golden Horn
X 18
and others (1987). The western half of the Lime Hills
quadrangle is underlain by three lithotectonic terranes and
by the Kuskokwim Group of sedimentary rocks (fig. 2).
These three terranes, the Nixon Fork, Mystic, and
Dillinger, have recently been combined as separate parts of
the Farewell terrane (Decker and others, in press).
The Nixon Fork terrane is found as a thin northeast-
trending belt of isolated outcrops in the southwestern
quadrant of the Lime Hills quadrangle. The Nixon Fork
terrane in the quadrangle is fault-bounded and composed
of thick Cambrian to Middle Devonian calcareous
-
x 5 0 35 KILOMETERS
X
6
Placers Hg-Sb Lodes
2 Alder Creek
1 White Mountain
3 Candle Creek 10 DeCourcy
6 Moore Creek 12 Snow Gulch
7 Granite Creek 13 Rhyolite
9 Flat 14 Red Devil
11 Donlin Creek
16 Mountain Top
15 New York CreekIMurray Gulch
17 Fortyseven Creek
18 Taylor Creek
19 Bonanza Hills
Figure 1. Location of study area and selected mines and prospects in adjacent quadrangles.