6 Pages in Charles Darwin's Library associated with "strata/epochs - primary"

A manual of elementary geology
By: Lyell, Charles, Sir,
Publication info: [s.n.], [s.n.], 1855
Pages: Page 251 Page 358
Principles of geology
By: Lyell, Charles, Sir,
Publication info: London, John Murray, 1837
Volume: v.4
Pages: Page 377 Page 380 Front Note 1 Front Note 1