sea-period

Updated: August 6, 2026

This conclusion will be very useful to go upon, since whatever decision may be come to as an explanation of one successive land-period and sea-period on the same spot, will be applicable to the eighteen or more periods necessary for the completion of some of the coal-fields.

Edward A. Martin - The Story of a Piece of Coal: What It Is, Whence It Comes, and Whither It Goes