Fig. 1

a Impregnation of a bedform by simple brushing, Tungurahua 2006 deposits. Note delimitation of individual plates with wooden strips separated by sticky tape, flatness of the surface and slight angle to the vertical. b Sediment plates packed in boxes for shipping. c A natural outcrop and d the resulting sediment plate with enhanced detail level, Tungurahua 2006 pyroclastic currents, note that the exposed (inner side) of the plate is mirroring the outcrop view when taken out. For interpretation, see Douillet et al. (2015). e Lapilli-type sediment plate stabilized with mounting foam and wooden boards at Laacher See before cutting and extracting the plates from outcrop. f Wooden frames on which sediment plates were mounted during the exhibition “G’Schichten von Tungurahua”