Age of Fishcreekian transgression

The Fishcreekian transgression is one of a sequence of late Cenozoic marine transgressions recognized on the Alaskan Arctic Coastal Plain. The Fish Creek beds of northern Alaska, which were designated as the type section for this transgression, contain fossils interepreted as Pliocene in age. Analysis of the benthic foraminifers in the Fish Creek beds, however, indicates that deposition occurred in the latest Pliocene and early Pleistocene between 1.7 and 1.2 Ma during a "warm' interval which was characterized by climatic conditions similar to the present or slightly warmer where temperatures shifted within a relatively narow range. -from Author