This paper, published in Geology, summarizes the evidence for a superplume event in the mid-Cretaceous from 120-80 Ma. This evidence is based on estimated oceanic crust production rates and a corresponding lack of magnetic reversals during this time. The author hypothesizes that the superplume event originated as a large plume from the core-mantle boundary, and identifies the South Pacific "superswell" region as the decayed remains of the original location of upwelling.
