3 Pages in Charles Darwin's Library associated with "strata/epochs - clay, London"

A manual of elementary geology
By: Lyell, Charles, Sir,
Publication info: [s.n.], [s.n.], 1855
Pages: Page 231
Manual of mineralogy
By: Jameson, Robert.
Publication info: Edinburgh, Archibald Constable & Co, 1821
Pages: Page 413 Page 413