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I've been working through a number of Green River fish I caught from the split fish layer (now called the sandwich layer) at the Warfield Fossil Quarry about 10 years ago. They have been stored away and I'm just now cleaning them up for display. Here are two slabs that are the part and counterpart of a Knightia eocaena. I split it out at the quarry, brought both halves home, sawed them into two rectangular slabs, then wrapped them up individually in two sheets of bubble wrap and put them away for all those years. After pulling them out of storage today and running some water over them to wash off the dust, I noticed this strange purplish-blue band running diagonally through the fish. It has very sharply defined edges and runs all the way through both slabs (you can see it on the sides and backs of both slabs). I've never seen anything like this before. Does anyone have any ideas what might have caused it?