Junction Butte basalt displays columnar jointing Overhanging Cliff

Junction Butte basalt displays columnar jointing at Overhanging Cli...

Detailed Description

Outcrop of the Junction Butte basalt alongside the road at Overhanging Cliff. The zone of prominent columnar jointing at the base of this thick lava flow formed by contraction cooling; it overlies stream-deposited sediments and is overlain by a zone of irregularly intersecting joints.

Details

Image Dimensions: 500 x 800

Date Taken: