GEOLOGY. 167 



they were parallel to the tangent of the central 

 elliptic core of Buwenzori at the particular place. 



The epidiorites mentioned above seem to have 

 been originally intrusive bands or dykes, and to 

 have been greatly altered. Gneissoid syenites, 

 representing what was originally a series of intru- 

 sive dykes, occur in the Yeria and other valleys, 



50 Mile; 







Fig. 26a. — Diagram- of Ruwexzori. 



but for full mineralogical details see Dr. Gregory's 

 (/. c.) paper. 



There has been, however, quite another era of 

 volcanic activity on Buwenzori, which is probably 

 long subsequent to the formation of the mountain 

 and may have been comparatively very recent. 

 I was able to find quite a number of little volcanic 

 craters and crater lakes. Some of these are quite 



