Siletzia is a massive formation of early to middle Eocene epoch marine basalts and interbedded sediments in the forearc of the Cascadia subduction zone...

formation of Eocene volcanic deposits on the Oregon coast. Siletz terrane: Siletzia, a tectonic terrane that forms the geological basement under northwestern...

Indonesian Archipelago) as it moves west. When the final archipelago, the Siletzia archipelago, lodged as a terrane, the associated trench stepped west as...

that marks the northernmost exposure of the Crescent Terrane (part of Siletzia), where basalt of the Metchosin Igneous Complex (correlative with the Crescent...

Laramide Orogeny ended around 48 million years ago, the accretion of the Siletzia terrane began in the Pacific Northwest. This began the volcanic activity...

United States, are a sequence of basaltic pillow lavas that make up part of Siletzia. The basaltic pillow lavas originally came from submarine volcanoes that...

the Klamath-Blue Mountain Lineament that marks the southeastern edge of Siletzia (see geological map, below). The Yakima Fold Belt is also located on, and...

Rock in Central Oregon and perhaps another flood basalt event known as Siletzia which underlies much of the Pacific Northwest coast with exposures in the...

southern end of Vancouver Island. It is the northernmost expression of the Siletzia terrane and consists of three rock units, including a basaltic sequence...

Third and last wave of plutons added to Sierra batholith. 51 Ma Eocene The Siletzia Plate collides with the Pacific Northwest, forming the coast of much of...