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PLATE 1. A, Yukon Valley, looking downstream from international bound-
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ary; B, Yukon River at the mouth of Washington Creek; C, Panoramic view of the narrows of the Yukon River at the mouth of Woodchopper Creek----
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2. A, Valley near the headwaters of the Charley River; B, Undif-
ferentiated (possibly upper Silurian) limestone along
the west bank of the Yukon River just above Takoma
Creek...
3. A, Contorted feldspathic quartzite in Birch Creek schist; B,
Augen gneiss, intrusive into Birch Creek schist___
4. A, Cambrian limestone and associated rocks on the north bank
of the Yukon River just north of Calico Bluff; B, Crinoids
in crystalline limestone of Silurian (?) age from west slope
of Loop Mountain, Yukon Territory...
5. A, Fossiliferous Middle Devonian limestone in Woodchopper
volcanics, as seen along the north bank of the Yukon
River opposite Woodchopper; B, Woodchopper volcanics
along the northeast bank of the Yukon River below the
mouth of Woodchopper Creek...----
6. A, Lower Mississippian chert formation on the east bank of the
Yukon River just below the mouth of Shade Creek; B, El-
lipsoidal greenstone in Woodchopper volcanics on the north
bank of the Yukon River above Woodchopper---
7. A, Undifferentiated Paleozoic greenstone in bluff on the west
side of the Yukon River at the mouth of Mission Creek;
B, Lower Mississippian volcanic rocks along the east bank
of the Yukon River above Circle----
8. A, Vertical beds of chert at north end of bluff on the west side
of the Yukon River below Takoma Creek; B, East side of
Calico Bluff, on the Yukon River below Eagle---
9. Enigmatical fossils in Mississippian or Pennsylvanian transitional
formation...
PLATE 10. A, Anticline and syncline in Tahkandit limestone (Permian) along
northeast bank of the Yukon River just above the mouth
of the Nation River; B, Conglomerate and sandstone of
Nation River formation on the east bank of the Yukon
River a few miles below Eagle...
11. A, Infaulted block of Tahkandit limestone (Permian) in midst
of Woodchopper volcanics (Middle Devonian) on the
south bank of the Yukon River about 1 mile below the
mouth of Coal Creek; B, Lower Cretaceous rocks (Kandik
formation) in bluff on the north side of the Yukon River
a few miles above the mouth of the Kandik River_.
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In pocket.
12. Geologic map of the Eagle-Circle district_-_.
FIGURE 1. Index map showing location of area covered by this report__-
2. Diagrammatic sketch showing structure of rocks in the fault
zone on the north bank of the Yukon River 3 miles above
Eagle....
3. Index to localities of fossils collected along the international
boundary by the Canada Geological Survey, as listed by
Cairnes...
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4. Geologic section from Takoma Creek northward along the
west bank of the Yukon River...
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5. Sketch of south side of Calico Bluff, Yukon River....
6. Section along the southwest bank of the Yukon River opposite
the mouth of the Nation River...
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