Denuded by the Indochina movement, the core of the palaeohigh has no cap rocks like the J4 gyprock.

古隆起核部因曾遭受早印支运动强烈，已无嘉四段良好膏岩作盖层。

Duiker, William J. U.S. Containment Policy and the Conflict in Indochina. Stanford: Stanford University Press, 1994.

著，《美国策和中南半岛冲突》，史丹福：史丹福大学出版社，1994年。