POTD: Columnar Basalt

Columnar Basalt
Yellowstone National Park
2011

Columnar basalt is one of the few types of rock I can easily identify when I see it, or at least I think I correctly identify it–I don’t generally have a geologist around to verify my conclusions.

Leave a Comment

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.