1. Preliminary map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon [microform] Yale Public content 1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : [Books and Open-File Reports Section, distributor]. English. Public. Cascade Range and Oregon.