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Q&A What is this wet/oily residue all over the rocks in my yard?

I live in the Sierra Nevadas, a little over 8,000 feet up. There's an area in my yard that has rocks with a bright shiny sheen to them. I've seen some kind of coating on nearby plants (which doesn'...

3 answers  ·  posted 8y ago by Eric‭  ·  last activity 6y ago by System‭

Question california identification