I was also hoping someone can comment on the ancient hammerstones where the finger divots weren’t the only areas rubbed revealing the images you see in a cameo effect style, would this be considered jewelry or art? What are the first examples of ancient chalcedony being used for jewelry or art? These examples traveled across the great land bridge and ancient people suffered a catastrophe and is probably why they turned some of their basic hammerstones into these picture message stones as I call them. There is also a half circle cut in many of the stones as deep as an eight of an inch and up to one inch long and I was wondering how big the faceted diamond or other primitive chisel would have to be to make that cut in these chalcedony nodules, and how long would it take to rub out a finger divot in one as well. Even though they usually only made finger divots in the softer fossil in the matrix? All of the samples have been authenticated by several museum curators, and any answers or contributions could be made part of the ongoing research.