Basalt
This is the volcanic rock wall of the canyon carved by the Henrys
Fork of the Snake River. It is basalt
and is hardened lava flow. The lava
flow visible on this side of the river looks to me to be 60
to 80 feet thick.
In areas like this near Riggins,
Idaho the Salmon River has cut through extremely hard basalt
leaving impressive vertical sides.
I wonder if this basalt got the
funky "crazed" appearance when the basalt
was blasted to make the roadcut?
Closeup of the same Idaho basalt
seen in the picture above
We
saw this in 2007 when driving on Idaho 64 less than 2-miles west of
Kamiah.
Basalt near Kamiah,
Idaho.
Click here for another Basalt
- 2
Click here for another Basalt
- 3
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