• Thumbnail for Siletzia
    Siletzia is a massive formation of early to middle Eocene epoch marine basalts and interbedded sediments in the forearc of the Cascadia subduction zone...
    92 KB (10,226 words) - 11:48, 13 September 2024
  • Thumbnail for Farallon plate
    island arc is completely subducted. 55–50 Myr ago the accretion of the Siletzia and Pacific Rim terranes occurred. 55–50 Myr ago the conclusion of the...
    16 KB (1,534 words) - 15:26, 29 October 2024
  • formation of Eocene volcanic deposits on the Oregon coast. Siletz terrane: Siletzia, a tectonic terrane that forms the geological basement under northwestern...
    776 bytes (136 words) - 21:48, 3 May 2019
  • Thumbnail for Leech River Fault
    that marks the northernmost exposure of the Crescent Terrane (part of Siletzia), where basalt of the Metchosin Igneous Complex (correlative with the Crescent...
    19 KB (2,176 words) - 00:51, 9 June 2024
  • Thumbnail for Pacific Coast Ranges
    Laramide Orogeny ended around 48 million years ago, the accretion of the Siletzia terrane began in the Pacific Northwest. This began the volcanic activity...
    17 KB (1,775 words) - 16:55, 3 November 2024
  • Thumbnail for Siletz River Volcanics
    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...
    7 KB (422 words) - 06:45, 25 August 2024
  • Thumbnail for Columbia River Basalt Group
    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...
    35 KB (4,212 words) - 06:33, 25 August 2024
  • southern end of Vancouver Island. It is the northernmost expression of the Siletzia terrane and consists of three rock units, including a basaltic sequence...
    927 bytes (74 words) - 22:08, 22 July 2023
  • Thumbnail for Geology of the Pacific Northwest
    List of volcanoes in Canada Olympic–Wallowa Lineament Puget Sound faults Siletzia Volcanology of Canada  This article incorporates public domain material...
    36 KB (4,678 words) - 08:58, 14 July 2024
  • 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...
    4 KB (99 words) - 19:00, 21 October 2023