New answers tagged sea
That looks like fossilised coral (possibly a sponge?), the outside is smooth because it's been worn down by the erosion of the sea. There is quite a lot of fossilised corral on the north Wales coast, it was once a shallow, tranquil, tropical Carboniferous sea The Carboniferous period from wiki: The Carboniferous is a geologic period and system that ...
Top 50 recent answers are included