272 Dr. Voysey's Private Journal [No. 4. 



To the westward and southward all the hills have the same appearance, 

 and I have no doubt that they are the same formation. 



Monday, 7 th March, 1819. — I wandered over some hills to the left 

 of Oudeghir, where I found trap tuff, wacke and carbonate of lime 

 (tuffaceous) in abundance, containing crystals of zeolite apparently of 

 fresh formation. At the bottom semi-columnar basalt very black and 

 of great specific gravity ; on the right of the town, there are very exten- 

 sive ruins of houses and other buildings. The stream which struggles 

 through the valley is fed by the infiltration from the hills. We passed 

 on our road to Doongong, over many pavements of basalt, some of 

 them semi-columnar with the interstices filled up by a secondary forma- 

 tion or injestion of basalt ; we saw also two remarkable elevations nearly 

 north and south. In the neighbourhood of Doongong, vast quantities 

 of wacke and basalt and trap tuff, alternating frequently and without 

 order. 



Wednesday, 9th March, 1819. — The land is waving as usual with a 

 few abrupt acclivities from two to three hundred feet in height. The 

 trap appears less subject to decomposition, having a very thin coat of 

 soil, and in many parts, it was found impossible to drive in the tent 

 pegs. 



Thursday, 17 th March, 1819.— I found on the road the basaltic 

 trap as usual, and in the neighbourhood of a ruined building some of 

 the iron clay in lumps, apparently brought from some distance. 



Saturday, 19 th March, 1819. — Reached Dammergidda at sunrise 

 and proceeded to the Manjera, which I crossed and encamped at Chil- 

 lelah in sight of Beder, distant about 5 coss seated on a hill. The left 

 bank is of the black alluvium, about fifteen or twenty feet high, sometimes 

 much less : the right bank rises to upwards of 60 feet in height, forming 

 a hill of considerable size on which Chillelah is seated ; the bank is com- 

 posed of large masses of an earthy and crystalline brown limestone very 

 much waterworn and containing large cavities which appear to have 

 been formerly filled by pieces of wacke, in some places containing large 

 masses of flint, and in others forming a compound rock being a cement 

 to a rocky compound of wacke basalt, clay and flint. Near the upper 

 part it has the appearance of regular stratification, and on its top wacke 

 easily decomposable is spread over it. I have yet to observe it more 

 closely. The carbonate of lime contains a small portion of alluvium. 



