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De afdruk ia ±345 -360miljoen jaar oud .Vaak is Belgisch hardsteen gebruikt in huizen vanaf ± 17-1900 gevelplaten en/of trappen met bordes werden van deze steensoort voorzien..
www.bgs.ac.uk/discovering-geology/fossils-and-geological-... info
www.joostdevree.nl/bouwkunde2/jpgh/hardsteen_4_met_het_oo...