In the western region all the Mesozoic systems, including the Trias, are well developed.
South and west of the Fossa Magna the beds are thrown into folds which run approximately parallel to the general direction of the coast, and two zones may be recognizedan outer, consisting of Palaeozoic and Mesozoic beds, and an inner, consisting of Archaean and Palaeozoic rocks, with granitic intrusions.
Not improbably this country was either "Gondwana-land," connecting Mesozoic India with Africa, or perhaps Africa itself.
And when we know that the Chrysomelidae and Buprestidae also lived in Triassic, and the Carabidae, Elateridae, Cerambycidae and Scarabaeidae, in Liassic times, we cannot doubt that the great majority of our existing families had already been differentiated at the beginning of the Mesozoic epoch.
In the eastern region this was the last folding which has affected the country, and the Mesozoic and Tertiary beds are almost undisturbed.