Upper and lower members of the Tamiami Formation of late Miocene age are exposed at the surface in southern Florida. Fossiliferous members contain distinctive Pecten species, two varieties of Ecphora, and other mollusks. A study of the molluscan fauna of these members indicates the presence of at least three concurrent range zones. According to age, with the youngest at the top, these zones are: (1) Pecten tamiamiensis zone; (2) Pecten jeffersonius zone; and (3) Pecten santamaria middlesexensis zone.

This study suggests certain time correlations between formations of southern Florida, northern Florida, and the Atlantic coast.

End_of_Article - Last_Page 1835------------