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Hi everyone, I picked up a piece of silstone from Glen Affric beach in New Zealand (attached picture). This is a Miocene site and some of you may have seen some of the awesome crabs that come from this locality. The siltstone is hard and may be calcerous (need to test with some acid). It is also full of bones. Many large bones (some can be seen in the picture) and lots of smaller fragments. I'm pretty sure the larger bones are from a whale or dolphin. Not sure which parts yet. My question is: Should I prep this with a scribe or would acid be useful? I've never used acid prep before but I thought maybe it would be advantageous when working with rock that is full of bone. It might be easy to keep on hitting them with the scribe. Has anyone done any acid prep before? I'd love to hear any suggestions. Thanks!