GMS-119, Geologic Map of the Oregon City 7.5’ Quadrangle, Clackamas County, Oregon. Publisher:DOGAMI This new geologic map of the Oregon City area is one of the first geologic maps in Oregon to be prepared using a laser based terrain mapping technology called lidar. Lidar (light detection and ranging) was used both to interpret and map the geology, but also as a base map on which to display geologic information. As a result, it is one of the most detailed and accurate geologic maps published in Oregon to date. CD-ROM Price: $ 15.00