8 T. 8. Hunt on Alpine Geology. 
jh 4 
ondary and older crystalline rocks to tertiary is explained by — 
Murchison, in accordance with the suggestion of H. D. Rogers, 
Geneva, shows at its base tertiary overlaid 
cretaceous rocks, upon which jurassic strata are superimpose 
Al 
) 
examples with that of the gneisses, chloritic and micac 
schists which in western Scotland, according to Murchison, 
overlie fossiliferous lower silurian » and are by him re- 
garded as younger. This, upon the authority of Murchison, 
Similar phenomena are met with along the north side of the — 
