8 Pages in Charles Darwin's Library associated with "strata/epochs - wealden"

A history of British fossil mammals and birds.
By: Owen, Richard,
Publication info: London :John Van Voorst,1846.
Pages: Page xv Page 546
A manual of elementary geology.
By: Lyell, Charles.
Publication info: [s.n.] :[s.n.],1855.
Pages: Page 251 Page 268 Page 350 End Note
Principles of geology.
By: Lyell, Charles.
Publication info: London :John Murray,1837.
Volume: v.4
Pages: Page 284 Page 310