Blue Biggs Jasper stone. Blue Biggs Jasper is a silicated volcanic ash. It was formed during a volcanic eruption and is part of a Miocene series of rocks called the John Day Formation, near Biggs, Oregon, USA. It is a decorative stone used for jewellery and trinkets.
Willamette River presents stunning lidar image on poster from Department of Geology
Willamette River, by Daniel E. Coe of the Oregon Department of Geology and Mineral Industries, displays a 50-foot elevation range, with lower elevations shown in white and higher elevations in dark blue. Coe used LIDAR data to make the map; he writes that he was inspired by maps of the Mississippi River made by Harold N. Fisk for a 1944 Army Corps of Engineers study. From Atlas of Design.