Claire G. Griffin: Anyone have a good handle on S. OR geology? This was an exposure not far from Gold Beach, OR in the Klamaths, in Rogue-Siskiyou NF. I think it's a paleosol of some sort in the Yolla Bolly terrane, but I don't have a great map and there's a mishmash of 3 terranes in the area

Anyone have a good handle on S. OR geology? This was an exposure not far from Gold Beach, OR in the Klamaths, in Rogue-Siskiyou NF. I think it's a paleosol of some sort in the Yolla Bolly terrane, but I don't have a great map and there's a mishmash of 3 terranes in the area

Does the Yolla Bolly terrane have any shale matrix melange in that region? It's been a long time since I thought about Franciscan geology!

Only saw shales in one spot along the forest service road, but it was there! Disclaimer: I am a biogeochemist, without a formal geology background :)

So interesting! In the original pictures, the super weathered "matrix" looks like it could have the fabric of a melange, but its hard to tell from the photo what the rock was before it morphed into a soil horizon!

Here's some nice unweathered Franciscan melange for you :) commons.wikimedia.org/wiki/File:Sh...

commons.wikimedia.org

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