A concretion is somewhat like a fossil, except the flesh and everything else is pretty much visibly. Being replaced by another medium such as calcium carbonate, or silica, or some hard form of substance.
Also the plate rocks have been described by others as a "hershies kiss" shaped rock, so I know others are aware of them. They just don't know what they actually represent.
I was thinking something like this.
https://www.minershop.com/technology/uvfluorescence/what-tenebrescence/
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