Editing Geology of the Alps (section)

===Intrusions===
In older rocks from the lower [[Crust (geology)|crust]] intrusions are found that formed during or just after the [[Variscan orogeny|Hercynian orogeny]]. These intrusions are older than the Alps and have nothing to do with their formation. [[radiometric dating|Radiometric age determination]] yields ages around 320&nbsp;[[annum|Ma]]. Slightly younger [[felsic]] intrusions formed by [[Permian]] and [[Triassic]] [[Extension (geology)|extension]] can also be found.

[[Intrusion]]s from the formation of the Alps themselves are relatively rare. The largest ones can be found along the Periadriatic seam, the largest one is the [[Adamello|Adamello granite]]. In the Penninic nappes [[migmatite]]s and small melts can be found.