Regional tectonic setting of the Portland Basin.

Portland, Oregon through a liar image. Depicts geographic features as well as field trip stops. Image contains an elevation color gradient.

A geological map of Portland, Oregon in a generalized form.

In 1991, David S. Morgan and William D. McFarland completed a project on the Portland Basin. This map is a conclusion of their findings.

The Willamette River’s main stem lies entirely in Northwestern Oregon. This river, that flows from the Oregon Coast Range and the Cascade Range, it along with it’s tributaries from the Willamette Valley. (A basin that not only includes the capital of Salem but also Portland, Oregon’s largest city.) The mouth of the Willamette at the Columbia is surrounded by the City of Roses