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
On March 15 [of 2025], the Trump administration sent “three planeloads” of Salvadoran and Venezuelan deportees, including Abrego Garcia, to the Terrorism Confinement Center (CECOT) in El Salvador, alleging that they were members of criminal organizations.