Chuckanut Mountains

The Chuckanuts are considered to be a part of the Puget Lowland Forest Ecoregion.

Its mountains include: The Chuckanut Mountains were formed by the folding of the Chuckanut Formation (which is predominantly made up of layers of 55-million-year-old sandstone, conglomerate, shale, and bituminous and sub-bituminous coal) and the later Huntingdon Formation (predominantly shale and sandstone) on top, as well as an exposed section of pre-Jurassic-age phyllite.

[3] In 1988, an outcrop of metamorphic phyllite, green chert, and milk quartz on Blanchard Mountain was exposed by a construction crew.

The outcrop is unique for its unusually large chunks of stilpnomelane.

This Whatcom County, Washington state location article is a stub.