A similar affinity exists between the life of the southern parts of Europe and that in the zone of Asia extending from the Mediterranean across to the Himalaya and northern China.
A British syndicate has been boring at several places in the zone since 1903.
Hence we find that the tar is formed of two distinct sets of products, the first due to incomplete decomposition and the second to secondary reactions due to the products of the decomposition being kept too long in the zone of heat.
On the northern side granitic masses occur in the zone of Ariege amongst the Jurassic and Lower Cretaceous beds.
They live in the zone where the Sahara desert meets with the large African savannas.
