Migration research developed significantly in the past decades. However, with life course approach and concept of transnational migration, there are still two different, as yet largely unconnected conceptual perspectives on migration. Both approaches have their merits but also shortcomings. This paper tries to overcome these shortcomings by combining advantages both suggest a unified theoretica...

Typical D.T.A. peak systems yielded by the fresh lower Ecca shales in the Durban and Pietermaritzburg areas are presented. The theoretical course of recrystallisation for these rocks is derived from chemical thermodynamic data. These theoretical results agree well with experimental observation. Carbon is found to dictate the course of recrystallisation on the basis of overall chemical rather th...