Controversy
Like many other impact structures in the world, such as Nördlinger Ries, the Vredefort crater, or the Sudbury Basin, the origin of the Azuara structure has been debated, and Spanish geologists still remain opposed to an impact origin. In their opinion the shock effects are tectonic features, the impact ejecta (Pelarda Formation) are Quaternary alluvial fans and impact breccias and dike breccias are interpreted as karst features and soil formations.
The opposition against the impact origin for Azuara has been supported by an analysis and paper (Langenhorst & Deutsch 1996) denying the occurrence of shock metamorphism in Azuara rocks. Based on this paper and analysis, Azuara was removed from the Canadian Impact Data Base when its management changed to the University of New Brunswick. Azuara is still listed as a confirmed impact structure in other data bases, e.g. Moilanen, J., and the Expert Database on Earth Impact Structures (EDEIS).
Read more about this topic: Azuara Impact Structure
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