Breccia-within-breccia; breccia generations

Polymictic breccia; Rubielos de la Cérida impact basin. Note the clast to the right of the coin which itself is a polymictic breccia (breccia-within-breccia).

Close-up 1

Close-up 2

Polished slab of a polymictic limestone breccia (top) and close-ups. Azuara impact structure. The breccia tells a complex story of formation. At least, four breccia generations can be observed. Also note the breccia dikelet cutting through a clast  (close-ups 1, 2). After the emplacement of the dikelet, the clast was again fragmented.