Fig. 1

Outline map of study area (redrawn and simplified after Jagt 1999b, fig. 1). Key: dashed lines = political boundaries; solid lines = rivers and canals; M = city of Maastricht; asterisk = quarry ‘t Rooth, Bemelen. For more detailed locality maps of this region, see Jagt and Jagt-Yazykova (2012, fig. 1) and, particularly, Felder and Bosch (2000, fig. 3.42). The inset map of the Netherlands (N), Belgium (B) and Germany (G) shows the approximate position of the main map (box)