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13.
Miocene age, as determined from invertebrate fauna, and its
stratigraphic position. It is termed "Modelo" because it
does not, as Jahns (op. cit. p. 166) points out, correspond
in age to the Modelo strioto sensu of Hudson and Craig. 1
Previously mapping in this area evidently has not
disclosed the full extent of this formation.
F.J. Hudson and E.K. Craig, Bull. Amer. Assoc.
~etrol.Geol., vol. 13, pp. 509-518, 1929.
