Dr. Cabrera's museum is so incredibly open that anyone off the streets can walk in and handle the stones. At one time, they could be purchased off vendor carts. No one can explain them. Only recently have scientists agreed on the continental shifts which have taken place over millions of years. Africa, the Americas, Asia, were once all configured radically different than today.
Most research confirms that without question.
However, these rocks, buried for countless centuries, depict precisely how the world looked millions of years ago. As I said, this is a hobby of mine, nothing more, but I would truly enjoy having someone explain the mystery. For reasons I do not understand, the rocks have received little attention. The information presented here comes from books, scant as they are, articles, and BBC productions. Also, this is purely empirical information, as I have seen no hard evidence or testimony, other than pictures of the very real and undeniable stones themselves.