4 Pages in Charles Darwin's Library associated with "strata/epochs - triassic, upper; keuper"

A manual of elementary geology
By: Lyell, Charles, Sir,
Publication info: [s.n.], [s.n.], 1855
Pages: Page 335 Page 337 Page 342
Supplement to the fifth edition of A manual of elementary geology
By: Lyell, Charles, Sir,
Publication info: London, John Murray, 1857
Pages: Page 25