- The Wikidata entry does not indicate this island is part of the Snohomish River. Look up other islands and determine how the river is specified, and then update this record to indicate the Snohomish River.
- Paleoproterozoic (Wikipedia)
The Paleoproterozoic Era (also spelled Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoic eon, and also the longest era of the Earth’s geological history, spanning from 2,500 to 1,600 million years ago (2.5–1.6 Ga). It is further subdivided into four geologic periods, namely the Siderian, Rhyacian, Orosirian and Statherian.
