Holocene time periods.png VersteeghEmma 2012 Thesis Figure 1.4: Archaeological and geological time periods during the middle to late Holocene in the Netherlands (Louwe Kooijmans et al., 2005), records of extension of the Great Aletsch glacier (Switzerland), west-central European lake-level records (Holzhauser et al., 2005) and Northern Hemisphere temperature reconstruction (Mann et al., 2003). LIA = Little Ice Age; MWP = Medieval Warm Period; RWP = Roman Warm Period.