A narrow (less than 30 metre) band of rockers Portland limestone forms the shoreline.

The outer hard rock is Portland limestone.

It is faced with white Portland limestone with a green copper spire.

It is where the famous Portland limestone was originally found.

Portland limestone is a limestone which was deposited in the latest stage of the Upper Jurassic period.

Portland limestone was formed in a shallow, warm, sub-tropical sea on the continental shelf of what is now western Europe.

Once the Siege was over, the fortifications were rebuilt and, in the following century, the walls were lined with Portland limestone.

Limestone, particularly Portland limestone, became popular in the 19th and 20th centuries for building things such as churches, banks and houses.

Many famous buildings in London are built from Portland limestone.

Portland limestone, a limestone rock in western Europe.