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The peridotite. We are still really excited about this find. Peridotite is from the mantle, so 10s of miles down. Rocks are formed during a huge, long composting process. Some are formed quickly during volcanic eruptions, others undergo the glacial till to rock process much more slowly. These rocks can work themselves up to the crust (where we have a chance of finding them). Eventually they may find their way back down to the mantle as the tectonic plates move over each other. I think I sort of understand. I'm sure I'm vastly oversimplifying and missing a lot. It is so fun to have this world literally opened up under our feet. I am so thankful for curious boys!