Welcome to DU!
The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards.
Join the community:
Create a free account
Support DU (and get rid of ads!):
Become a Star Member
Latest Breaking News
Editorials & Other Articles
General Discussion
The DU Lounge
All Forums
Issue Forums
Culture Forums
Alliance Forums
Region Forums
Support Forums
Help & Search
Apparently, they are the basaltic remains of eroded lava flows . . .
. . . from Eastern Oregon!!
It's hard to get my arms around the massive scale of the volcanic events resulting in their creation.
Edit history
Please sign in to view edit histories.
8 replies
= new reply since forum marked as read
= new reply since forum marked as read