Heading back toward Corvallis, we got off I-5 in the North Eugene-Coburg area to get a better look at an outcrop we'd passed at other times. It's quite visible from the freeway, but there's no good or safe spot to stop and get a better look-see. I took a number of photos here, but I'm not really happy with any of them.
Here's an annotated version. I'm not sure if we're actually seeing the right/south margin of the dike here, so that's dotted. Also, now that I have the photo marked up and loaded, it occurs to me the sedimentary rocks are more likely Oligocene age. The dike rolling over into a sill is probably a Western Cascades hypabyssal intrusion.