arrowbookcheckclosecommentfacebookfavourite-origfavouritegooglehomeibapdfsearchsharespotlighttwitterwelsh-government

Description

Some sedimentary rocks such as limestone are composed of the ground shells of ancient molluscs. Some shells survive whole as fossils along with the remains of other sea animals such as shark. These fossils are from the Eocene (40-55 million years) and Silurian (395-440 million years).

Comments (0)

You must be logged in to leave a comment