or this interface : https://regisgallon.wordpress.com/r-software/g2sd-r-interface/
and this reference : https://journals.openedition.org/geomorphologie/10513
Fournier J., Gallon R.K., Paris R. 2014. G2Sd: a new R package for the statistical analysis of unconsolidated sediments. Géomorphologie, relief, processus, environnement, 20(1), 73-78.