Materials examined. Khemis wadi (KH1): 6 L, 20.ii.2014; 30 L, 21.vii.2014; 12 L, 14.iii.2014; 24 L, 11.i.2015; 9 L, 30.i.2015; 15 L, 17.iii.2015; 18 L, 14.v.2015; 5 L, 14.v.2015; 12 L, 29.viii.2015; 14 L, 23.iii.2016; 16 L, 04.vii.2017; 13 L, 8.iii.2018, 3 L, 4.iii.2019.