Azuara Impact

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Abstract.- Spallation, a well-known process in fracture mechanics, plays a major role in meteorite impact events and is evident on all scales from megascopic spall plates and with larger structural features, over mesoscopic dynamic deformations in particular of conglomeratic target deposits, down to microscopic shock spallation in mineral grains. Here I report on experimental spallation, on various geological implications of impact spallation and on mineralogical spallation evidence, with a special focus on the Spanish Azuara and Rubielos de la Cérida impact structures and the Ries impact crater in Germany.