1. Map showing distribution, composition, and age of late Cenozoic volcanic centers in Oregon and Washington [cartographic material] Yale Public content 1982. 2014-04-01T14:54:29Z. 2014-04-15T22:13:37Z. Luedke, Robert G. Dept. of the Interior, U.S. Geological Survey. English. Public. Oregon and Washington (State). Cenozoic and From 65 million years ago.