https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/subdivisions/subperiods/early-carboniferous/early-carboniferous.md
The seas of the Early Carboniferous were dominated by rugose corals, brachiopods, bryozoans, sharks, and the first bony fish.
Pangaea existed as a supercontinent for 160 million years, from its assembly around 335 million years ago (Early Carboniferous) to its breakup 175 million years ago (Middle Jurassic).