GEOCHRONOLOGY DE GEER 



691 



varve variation in its general features is a function of solar radia- 

 tion, it is at the same time more or less influenced by local factors 



Figure 3. — Swedish ice-rccessiou epochs ns basis for internatioual chi'onology 



such as the topography of the ground on which the deposit is made, 

 changes in the direction of the melting rivers, the varying composi- 



