The First Discovered Last Glacial Maximum (LGM) Event in the Middle and Lower Region of the Yongding River Basin, Southern Beijing Plain

摘要

Objective LGM is a critical climate period in the late Quaternary and is the most recent extreme cold event.Clark et al.(2009)used 4271 14C records and 475 cosmogenic nuclide datings to define LGM be in 26.5–19.0 ka BP.LGM age often changes with time in different regions(Mix et al.,2001;Zhang Zhigang et al.,2015).However,LGM has not been described to date in the Beijing region.During our field work in 2015–2017,LGM event stratigraphy