Editing Breccia (section)

===Impact===
[[File:AlamoBrecciaMedium.jpg|thumb|[[Alamo bolide impact]] breccia (Late [[Devonian]], Frasnian) near Hancock Summit, [[Pahranagat Range]], Nevada]]
Impact breccias are thought to be diagnostic of an [[impact event]] such as an [[asteroid]] or [[comet]] striking the Earth and are normally found at [[impact crater]]s. Impact breccia, a type of [[impactite]], forms during the process of [[impact crater]]ing when large [[meteorite]]s or [[comet]]s impact with the Earth or other rocky [[planet]]s or [[asteroid]]s. Breccia of this type may be present on or beneath the floor of the crater, in the rim, or in the [[ejecta]] expelled beyond the crater.

Impact breccia may be identified by its occurrence in or around a known impact crater, and/or an association with other products of impact cratering such as [[shatter cone]]s, impact glass, [[Shocked quartz|shocked minerals]], and chemical and [[Isotope|isotopic]] evidence of contamination with extraterrestrial material (e.g., [[Iridium anomaly|iridium]] and [[osmium]] anomalies). An example of an impact breccia is the [[Neugrund breccia]], which was formed in the [[Neugrund crater|Neugrund impact]].