A photo of Sunshine Lava Tube
By Geology and Ecology of National Parks
June 2011 (approx.)
Detailed Description
Note the pear-shaped character of this passage in Sunshine Lava Tube. A congealed lava flow covers the center of the passage. The dark areas along the side are pathways coated with smaller cinders for easier walking in the caves.
Sources/Usage
A photo of Sunshine Lava Tube