Gray whetstone, little tapered in shape and oval cross-section, whetstone sharpening stone tool kit earth found stone shale, minced chopped elongated whetstone or sharpening stone. Gray natural stone Lightly tapered. Oval section Wide sides smoothly polished by grinding and laws. Deep kerf in the middle at right angles to the legeas archeology Valckensteyn Poortugaal Albrandswaard stone sharpening laws inciting harvests sharpening Soil discovery: castle Valckensteyn in Poortugaal now Albrandswaard