Early Pleistocene (also known as Lower Pleistocene, or Calabrian) is a subdivision of the Pleistocene Epoch of the Geologic time scale. The beginning of the stage is defined at 1.806 ± 0.005 Ma (million years ago). The end of the stage is defined by the last magnetic pole reversal 781,000 ± 5,000 years ago. Originally the Calabrian was a European faunal stage primarily based on mollusk fossils. It has been subsumed into, and become equivalent to, the geologic stage called the Early Pleistocene. However, many of the mammalian faunal assemblages of the Early Pleistocene start in the Gelasian (last stage of the Pliocene). For example, the Platygonus and other Blancan fauna appear first in the Gelasian.