Inselbergs of batholithic rocks on a rejuvenated erosion surface, Madagascar. The crystalline floor has been bevelled by a vast erosion surface that is slightly rejuvenated as indicated by the rivers which begin to cut down. On the surface lies a group of Inselbergs whose steep slopes form a clearly visible angle with the erosion surface. They are residual hills of harder rocks belonging to an oval shaped batholith the outline of which is indicated by the drainage. Erosion of this group was clearly fracture-controlled. In places the erosion surface penetrates into the group and all the batholithic rock has been removed. France Institut Geographique National. Relief form atlas, 1956, p. 103.