How cool is that!
Way long time ago, in the '50s and '60s when my kids were young, we found quite a few rocks with embedded clam shells here in the Fresno/Clovis area. I've always wondered if that was because of Noah's flood, as this is way far from any water. I never saved any of them, not thinking they were important at all.
We have them here too, but then at one time we were under water.