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74

PLATE 1. A, Yukon Valley, looking downstream from international bound-

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.--

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

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