yorkshire.fossils Here’s one of our golden stones known as “cannon balls”. These rocks are naturally coated with a pyrite (fools gold) layer and so can be polished! It contains an Eleganticeras ammonite and is 185 million years old from Sandsend UK. Yorkshire is the only place in the world that these cannon balls can be found! The bottom half is yet to be polished, though we quite like it how it is.