Waterman Rock is a house-sized greenschist erratic with a circumference of 155 feet (47 m) and height of 38 feet (12 m) to 40 feet (12 m) or greater in Saratoga Woods Preserve near Langley. It may be the second largest erratic in Washington State, after the Lake Stevens Monster. The property including the rock was acquired in 2002 or 2005 for conservation.
The Pacific Ocean was born 750 million years ago at the breakup of Rodinia, although it is generally called the Panthalassa until the breakup of Pangea, about 200 million years ago.