This diagram of Argand "…illustrates his concept of the vast compression of upland Asia; it represents a longitudinal section from India up to the Tien Shan range as he thought it would have been at the close of the Tertiary. The hatched areas signify the supporting sima; the unhatched, the sial blocks; the dotted, the products left by the Tethys. The basic (sima) rocks entrained by the sial are indicated. The arrows show the relative movement. Overall we are involved here with a gigantic overthrust, in which the sial Lemurian block was forced under the Asiatic block", (Wegener, 1929). (Note: sima refers to oceanic crust; sial to continental crust.)
See second image for a modern diagram by Press and Siever (1994).
