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GEITSI GUBIB, AN OLD VOLCANO. 
By A. W. Rogers. 
(Read April 21, 1915.) 
Ever since I became acquainted with the volcanic necks at Saltpetre Kop 
and its neighbourhood, an account of which was laid before this Society in 
1904, I had wanted to visit Geitsi Gubib, of which Dr. Schenck's short 
description seemed to show that it is a similar neck on a larger scale and 
with some remarkable characters not seen at Saltpetre Kop. Subsequently 
Dr. Scheibe gave the S.A. Museum some pieces of breccia from Geitsi 
Gubib which supported my suspicions. 
During a journey in German South-West Africa in 1914, which the 
Union Government allowed me to undertake on the suggestion of Pro- 
fessor Penck, of Berlin, I had the opportunity of staying two days on the 
mountain, and the present paper is based on the notes taken then and on 
the examination of the rocks brought away. 
I must thank the Government of German South-West i\frica for the 
extremely liberal way in which transport was provided, and I especially 
wish to thank my friend Professor Hans von Statf, who was asked by that 
Government to accompany me, and who took the greatest trouble to make 
our journey as successful as possible. Dr. von Staff and I were at Geitsi 
Gubib together, and many of the facts recorded below were discussed on 
the spot. I regret that circumstances have made it impossible to discuss- 
with him the results of the further examination of the rocks themselves.'-' 
Though there are several books and papers t which mention Geitsi 
* I deeply regret to learn that Dr. von Staff has died recently. Sept., 1915. 
t Hans Schinz, in " Deutsch. Siid West Afrika " (preface dated 1891), p. 464, calls it a 
" Porphyrkegel," The late Mr. J. C. Watermeyer, who ascended the mountain in com- 
pany with Dr. Kehbok in 1897, said that the " circular mountain chain . . . gives it the 
appearance of the crater of a huge extinct volcano. The rocks of this plateau are to a 
great extent basaltic," a mistake evidently due to the brown crust and pitted surface of 
some of the rock. (Trans. S.A. Phil. Soc, vol. xi., p. 28, 1899.) 
Dr. Th. Eehbok in " Deutsch. Siid West Afrika, sein wirthschaftliche Erschliessung," 
Berlin, 1898, refers to it as a mountain of porphyry which his party was the first to 
ascend, forgetting Schenck's visit, pp. 16 and 35. In another publication, "Deutsch. 
