MINBU. 



49 



Mr. Mallet's otherwise so exhaustive paper 1 does not say whether the 

 mud volcanoes of these islands are directly built up on tertiary 

 beds or on alluvial strata. 



Fig. I. — Diagrammatic section through the Minbu mud volcanoes. 



In conclusion I may say, that no fiery eruptions have been ob- 

 served at Minbu ; the gas is inflammable, but there are no instances 

 on record of its spontaneous ignition. If ignited, the gas bubbles 

 will explode with a faint flame, but every new bubble will have 

 to be ignited again. I have been told that some of the northern 

 wells had been set on fire, where the petroleum occurs in a thick film, 

 but this cannot have burnt very long as no traces of it were visible. 



Chapter IV.— THE PETROLEUM FIELD OF YENANGYOUNG. 

 i. — Geographical position, area, and physical 



GEOGRAPHY. 



According to the latest map of the Survey of India, the village of 



Yenangyoung 2 is situated at Lat. 20° 29' N. and Long. 94 56' E. on the 



left bank of the Irawadi, in the Magwe District of the Southern 



Division of Burma. The petroleum field is not exactly close by to 



the village, but lies some distance inland towards east. This distance 



has been variously estimated by different visitors as between three 

 *. 



J The mud volcanoes of Ramri and Cheduba. Records, Geol. Surv. of India, 

 XI, 188-207 1 1 878). 



3 The name of this village has been variously spelled as Ranangoong, Rainang- 

 hong, Yanangheoum, Yunanyaung, Yenan Gyong, Rainoung or even Hong Ragoon, 

 all, however, referring to one and the same locality, Yenangyoung. 



= ( 95 ) 



