X Marks the Spot

I went with a couple of mineral clubs on a big group trip to National Limestone Quarries in Snyder County, PA to collect shiny crystals. We got to the top of a mountain overlooking one of the quarries, looking for wavellite. Someone who was there before told us to "Look for the fossils. If you see green, crack it open." Oh, the horror! I did, however, manage to have my cake and eat it, too, as it were. How's this 4cm trilobite for a lovely X to mark the spot? Age is probably Silurian, but the  formation is unknown.