Referred to as the Lake Stevens Monster, the giant rock is considered the largest erratic in Washington and maybe in the United States. It measures 34 feet tall and 78 feet in length with a circumference of 210 feet.
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).