Pleistocene 3 : An epoch of the Quaternary period, spanning the time between 1.8 million years ago and the beginning of the Holocene at 10,000 years ago. (GSA 1999 Geologic Timescale)
U.S. Department of the Interior, U.S. Geological Survey, US Geological Society (USGS), Glossary of Volcano and Related Terminology, USGS/Cascades Volcano Observatory, Vancouver, Washington, USA 2006. http://vulcan.wr.usgs.gov/Glossary/volcano_termino logy.html, (ND/ Volc Sci - Amer) {493}