 Roger Collins cites the work of Pierre Guichard to argue that Berber groups in Iberia retained their own distinctive social organization.According to this traditional view of Arab and Berber culture in the Iberian peninsula, Berber society was highly impermeable to outside influences, whereas Arabs became assimilated and Hispanized.Some support for the view that Berbers assimilated less comes from an excavation of an Islamic cemetery in northern Spain, which reveals that the Berbers accompanying the initial invasion brought their families with them from north Africa.