related tags: 5B4A3F 7E817E 7F807F 986D4D A39D96 A99E8F B18E6A BE6728 D48E47 county eruptive fluvial fossil fossils holocene hood lahar lahars maid mt multnomah old oregon oxbow park phase reexhumed river sand sands sandy standing still sub subfossil subfossils tree trees wood 1781 694830