Announcing the Geology Haiku Meme
deep in a bioreef
a Permian story
calcite dripstones tell
Rules: Three lines and a max of seventeen syllables. Use of kigo, which is the traditional reference to a season, may be substituted by a reference to a geological period. The use of kireji, which is a word that serves to give structural support to the verse is not widely practiced in English haiku, so you may give that a pass.
Leave a link in my comments section and I'll post a collection of Geology Haiku links soon :-)
See: A Collection of Geological Haiku