“…Schultz 1968;Riegel 1973Riegel , 1975Riegel , 1982Huwe et al 2003). Furthermore, such studies mainly focus on the Ardenne, the western extension of the Eifel in Belgium and Luxembourg (Leclercq 1960;Streel 1986;Streel et al 1987;Steemans and Brasseur 1999;Steemans et al 2000) or the Hunsr€ uck Mountains south of the Eifel region (Brocke et al 2017).…”