7 Pages in Charles Darwin's Library associated with "geology - cavern"

A history of British fossil mammals and birds
By: Owen, Richard,
Publication info: London, John Van Voorst, 1846
Pages: Page 212 End Note
Principles of geology
By: Lyell, Charles, Sir,
Publication info: London, John Murray, 1837
Volume: v.2
Pages: Page 356 Page 356 Page 380 Page 380 Page 99