Ejecta surrounding the 26-km-diameter Ries Crater, Germany, may be helpful to the interpretation of the Cretaceous Tertiary (C T) Boundary Event. The Ries ejecta can be classified into three major facies: (1) moldavite tektites, (2) Bunte Breccia, and (3) suevite, each of which represents a temporally and spatially distinct ejection regime. The petrographic and geochemical characteristics of each facies are also distinct, reflecting an orderly stratigraphic succession of the Ries target. Moldavites represent early high-speed ejecta originating at or close to the projectile-target interface; Bunte Breccia reflects the major excavation and ejection phase and comprises >90% of all ejecta beyond...