Fig. 7.

Ploughmark morphology statistics for randomly sampled subsets. (a) Example of frequency distribution of the width to incision depth ratio. (b) Scatter plot of keel incision depth vs keel widths with main statistic parameters annotated in the insets. Based on the analysis of random subset sampled from the interpreted ploughmarks within the palaeo-surface T0 (Base of the Sequence T). Data points are coloured according to the ploughmark orientation (see colour key in Fig. 4).