This is the final portion of the spoken presentation that I gave about three weeks ago for the Oregon Master Naturalist Program at Silver Falls State Park, east of Salem, Oregon. There was another planned portion, on non-tectonic geologic hazards- I had intended to focus mainly on mass movement, with some mentions of flooding, though I don't have any good photos or images of the latter. However, due to some issues with logistics, time became an issue, and we dropped that segment. I will cover it in much the same way as with this and the previous four segments. I should also do a quick and dirty summary of Bob Lillie's portion, on plate tectonics and the tectonic setting of the Willamette Valley. In addition, I had about 30 rock samples to illustrate typical kinds of geologic material one might find in and around our area. I don't have photos, yet, but I may get up the gumption to take some shots, and I've kept the sheets I placed the samples upon, with names and notes for each, so it shouldn't be too much trouble to transcribe those.
We had anticipated walking down the path to North Falls, which definitely has the most diverse and interesting geology in the park, but the smallish parking area there was almost completely full. While we had anticipated problems with everyone driving, and had arranged ahead of time for participants to pool into a minimum number of cars, we still had about 7 vehicles, and when we arrived, there was one parking spot available. So we regrouped at a nearby parking area with an overlook, and decided to bag North Falls. Parking at South Falls is much more extensive, so we headed there. We had planned on visiting the CCC building, with its marvelous fossils anyway, and while the geology exposed at South Falls isn't as in-your-face, we figured it would suffice... and it turned out better than we'd planned, for reasons I'll get to presently.
I'm also going to submit this as my entry for this month's Accretionary Wedge, hosted by Evelyn of Georneys, Fun Field Camp/Trip Moments, because this did indeed end up being a lot of fun.
This Week's Geo-Quiz: Geologic Maps
10 hours ago