5 Pages in Charles Darwin's Library associated with "strata/epochs - chalk"

  1. Lake Superior: its character, vegetation, and animals, compared with those of other similar regions.
    By: Agassiz, Louis,
    Publication info: Boston :Gould, Kendall & Lincoln,1850.
    Pages: Page 258  Page 285  End Slip 2, side 2  
  2. A manual of elementary geology.
    By: Lyell, Charles.
    Publication info: [s.n.] :[s.n.],1855.
    Pages: Page 251  Page 350