Information https://stonelibrary.shu.ac.uk/purbeck-limestone-d3-to-d6/
RELATED MATERIALS
Purbeck Thornback (D3) https://stonelibrary.shu.ac.uk/purbeck-thornback-d3-limeston/
Purbeck Cap (D4) https://stonelibrary.shu.ac.uk/purbeck-cap-d4-limestone/
Purbeck Marble (D5) https://stonelibrary.shu.ac.uk/purbeck-marble-d5/
Purbeck Marble (D6) https://stonelibrary.shu.ac.uk/purbeck-marble-d6/
Purbeck Marble (D7) https://stonelibrary.shu.ac.uk/purbeck-marble-d6/