574 E- C. ABENDANON 



phase principale de plissement, dont I'intensite a ete veritablement 

 tres grande, est la phase de dislocation post-triasique, dont les 

 effets ont ete considerables; je la considere avec M. Lantenois 

 comme une phase himalayenne : (p. 257) Tensemble du Yun-Nan 

 est alors plisse d'une fagon tres energique, les charriages y prennent 

 ■une amplitude tres grande et la region du haut Fleuve Bleu (Yang- 

 tse-Kiang), prolongement sud du Yung-ling-chan, est charriee sur 

 la region yunnannaise." The last movements were due to the 

 upheaval which raised Yun Nan to the relatively high altitude 

 which it occupies nowadays. They occurred during the Plio- 

 Pleistocene.^ 



It is clear that the tectonic movements of Yun Nan, where the 

 excessive thick Old Paleozoic series appear on such an extensive 

 area and with a particularly great richness of fossils, have been 

 extremely intense and numerous. 



In Northern Annam, F. Deprat^ discovered at Ben-Thuy the 

 Ordovician, and he believes that this formation will also be dis- 

 covered in Tonkin and Laos. The Devonian and Dinantian are 

 also represented in this region, and the Uralian is once more in 

 transgression (exactly as in Yun Nan) upon a folded and denuded 

 territory of the older Paleozoic. 



In the same way as in the Northern Shan States far to the west, 

 here in the east of Southeastern Asia we find the most southern 

 country where fossils of the Old Paleozoic have been discovered; 

 for according to Suess, in the plain of Tonkin soft schists have 

 been assigned to be Devonian; but this point is far from being sure 

 (Vol. II, p. 277). In the island of Hai-Nan, we find Suess men- 

 tioning (Vol. Ill, Part I, p. 297) that according to Madrolle, the 

 center of the island is composed of granite and schists, and is 



^ These last movements of epirogenic character, giving rise to the phenomena 

 of what I have called anticlinal distraction (in a booklet titled Die Grossfalten der 

 Erdrinde, Leyde, Holland, 1914), which phenomena led to the forming of important 

 tectonic depressions, are so completely similar to those of the Plio-Pleistocene period 

 in Central Celebes, where I have classified them together in a single process of grand- 

 folding, that I do not hesitate to identify the most recent epirogenic movements of 

 Yun Nan with those of Central Celebes, the latter having induced the upheaval of 

 this country to its present high altitude. 



= "Sur la decouverte de I'Ordovicien, a Trinucleus, et du Dinantien dans le 

 Nord-Annam, etc.," Comp. Rend. Ac. d. Sc, 28-5-12, T. 154, pp. 1452-54. 



