You are browsing the archive for 22 September 2017 - Mountain Beltway.
22 September 2017
Friday fold: bend in a vesicular lava flow, Etna
It’s the First Friday of Fall! Here’s a sort of fold to help you celebrate: a section through a ∧ shaped bend in a vesicular basalt flow from the eastern flanks of Mount Etna in Sicily. It’s due to volcanic lava flowing rather than ductile deformation of a pre-existing solid rock (our usual habit with this feature), but I think we can appreciate it regardless: