nemfrog:“Interior of a rhyolytic lava stream…showing broad sigmoidal folds produced by the slow movements of the mass.” Volcanoes. 1881.Internet Archive
tags:
from: https://amused-itself-to-death.tumblr.com/post/642384066353741824
tags:
from: https://amused-itself-to-death.tumblr.com/post/642384066353741824