The field book covers the work of Donald F. MacDonald in the Canal Zone with Dr. [Thomas W.] Vaughan, November 4 - 14, 1911, June 29, 1912. The volume begins with a table of contents listing page number and location. The entries are dated and headed with location. Entries include geological sections, descriptions of geological characteristics of strata, presence of fossils, specimen collecting, and daily work.
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