Current status and some possible options for formalizing the “Quaternary” interval of Earth history. Durations of stages, epochs and “Quaternary” on the geologic time scale are according to their span in millions of years. The Neogene Period begins at ~23 Ma (after OGG 2004).
The IUGS (International Union of Geological Sciences) ratified the Quaternary as a Period/System on May 28, 2007 –legitimizing the recent and future use of this term - so now the actual discussion has to set the exact position of the base of the Quaternary and the base of the Pleistocene Epoch/Series and Gelasian Age/Stage. The INQUA supports the proposal to lower the base of the Quaternary from its present IUGS-sanctioned position at the base of the Pleistocene Vrica GSSP (1,8Ma) to the base of the Gelasian Stage GSSP (at 2.588Ma). The current boundery is inappropriate because there are no important global changes at 1,8Ma, without events that can be recognized and correlated globally.