The Geologic Setting of the John Day Country Grant County Oregon

Cover The Geologic Setting of the John Day Country Grant County Oregon
The Geologic Setting of the John Day Country Grant County Oregon
Geological Survey Us
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(At 105. 3 turn east on State Highway 402 along the North Fork of the John Day River) PICTURE GORGE BASALT DIKE ** 4 JQN& 'T^-lb m%h.
Fig. 8. Basalt dike two miles south of Kimberly.
K. Basalt Dike. A basalt dike 15 feet wide cuts basalt flows in 5, 0 bluffs north of the road and forms a wall 20 feet high in places; it is visible also across the river.
L Parallel Dikes. Two prominent parallel dikes, among others, 11. 2 form crests of hogbacks south of the river. A small tapering dike cuts pink
...and white beds of the John Day Formation in the river bluff. This dike is the southwest end of an irregular intrusive mass of basalt in which the river has cut a steep-walled gorge.
16 M. 13. 2 N. 18. 0 0. 20. 1 Basalt Intrusion. The road is cut through 300 feet of basalt in- truded into the John Day Formation. Both contacts are well exposed. The basalt when molten baked and reddened 3 to 6 inches of the adjacent beds.
(At 13. 9 the highway crosses the North Fork of the John Day River and follows the Cottonwood Creek Valley) Irregular Dikes.


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