State by State


  • Specimen Number


  • Description

    Light maroon-colored slab of massive, uniform, sedimentary rock. Probably a siltstone or fine sandstone. The bedding planes are parallel to the slab surface.  The right-hand side shows a broad curve consistent with it being the resistant bed in a cliff weathering back.

  • Classification

    Sedimentary. Mudstone or fine sandstone.

  • Location & Occurrence


  • Geological Age


  • Geoheritage

    Unusually simple rock, probably the simplest in the collection.

  • Links

    Link to State Geological Map from USGS.  Link to Oregon Department of Geology and Mineral Industries (DOGAMI).

  • Other

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Specimen stone for Oregon.
Alt Text for Image Here Outline of Oregon. Geo Map of Oregon.