The Clallam Formation is a geologic formation in Washington (state).
It preserves marine fossils dating back to the late Oligocene and early Miocene period.
It outcrops on the northern Olympic Peninsula and along parts of the Strait of Juan de Fuca.
This article about a specific stratigraphic formation in Washington is a stub.
You can help Wikipedia by expanding it.This article related to the Neogene period is a stub.