The 35-40 km-diameter Azuara impact crater is located in northeast Spain roughly 50 km south of Zaragoza. The name is attributed to the small town of Azuara located near the center of the structure. The first hint to a possible impact origin was given by Wolfgang Hammann as early as 1980, and the first field evidence was provided by Johannes Fiebag in the early eighties. In 1985, Ernstson et al. published the occurrence of shock metamorphism, and Azuara was established. The Azuara structure exhibits a roughly circular morphology implying a partly pronounced outer ring. The inner part is covered by post-impact Upper Tertiary sediments, however in the outer rim zone, the outcrop conditions are excellent.

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