208 Dr. F. P. Mueller — Tektite from British Borneo. 



The sand deposit certainly does not belong to the present epoch, but 

 is at least of diluvial age. It is evident, therefore, that the tektites, 

 like those of Billiton and of the Federated Malay States, geologically 

 speaking are also of diluvial age. 



SCALE 

 100 o 100 200 300 



fli/ea 



Occurrences of Billitonite 





FlG. 1. — Map showing the area in which is included all known occurrences of 

 Billitonite in the Malay Archipelago (dot and dash line). 



The general characters of the Brunei specimens are shown in the 

 following table (Table I) :— 



Table I. 



The four specimens have the brilliant black lustre which is 

 commonly characteristic of tektites. They are completely scored 

 with very small marks, which makes their surface appear as if fine- 

 grained. Closer examination shows the hemispherical moon-like 

 hollows, often incompletely developed, which so commonly occur on 

 Billitonites. Nos. 1 and 4 show a few deep, elongated pittings slightly 

 wrinkled, rather smooth inside. 



