558 



/. B. SCRIVENOR 



rocks; in British Malaya these are chiefly granite, which yields the 

 wealth of tin-ore with which the country is endowed. 



Figure i is a sketch-map showing the coulisses in the Malay 

 Peninsula and their probable connection with coulisses in the Malay 

 Archipelago. The latter coulisses are taken from a paper by 

 Van Es.^ The dotted line shows the sweep of the arc as given in 

 Figure 72 on page 147 of Professor Hobbs' work. My sketch-map 

 shows that this arc is really a band in which are many small folds. 



Junk ceylom 



Fig. I. — Sketch-map showing couKsses in the Malay Peninsula and Archipelago. 

 The dotted line is the Peninsular-Bornean arc as shown in Fig. 72, p. 147, of Professor 

 W. H. Hobbs' Earth Evolution and Its Facial Expression. The sketch-map shows that 

 the arc is really a band containing many small folds. 



Figure 2 shows in some detail the coulisses in British Malaya. 

 The basis of the structure of the country may be described as a 

 number of granite ribs or ridges occupying anticlines or more 

 complicated folds in the older rocks, and connected in depth with 

 a granite bathyhth. These granite ribs, it may be argued, are in 

 themselves so substantial as to merit the name of bathyliths, but 

 their elongated form and small lateral extent make me think the 

 term inapplicable. 



' L. J. C. Van Es, "De tektoniek van de westelijke helft van den Oost-Indischen 

 Archipel," Jaarboek van het Mijnwezen in Nederl. Oost-Indie, Vol. XL VI, Part II 

 (1917), pp. S-I43- 



