Description
Silicified Sponge
Cretaceous
Garraf, Catalonia, Can Casanyas Castellet, Spain
62mm silicified sponge cluster.
Sponges are a truly ancient group of animals. During the Cambrian, they already had the same biomineralized skeleton they have today. Their ancestors go back somewhere in the Precambrian. The Cretaceous is like last Thursday to them.