Professor T. Rupert Jones — Geology of W. Swaziland. 107 



both from his own knowledge and from communication with Mr.Eyan, 

 who has a clear notion of the structure of the district, as shown by 

 his plan and sections. 



In the course of his researches in the tin-bearing gravels of the 

 -Embabaan, Mr. Eyan found some very tine stone implements, made 

 and used by earlier occupants of the country. He also discovered 

 the rock, in situ, of which these ancient tools were made. These 

 large South African implements have been described and illustrated 

 in the Journal of the Anthropological Institute, new series, vol. i 

 (1898), pp. 48-54, pis. iii and iv. They consist of varieties of the 

 grey and black lydianized and mylonized grit and breccia of 

 Section T, division c, which passes along near the middle of the 

 Ingwenya Berg, as a constituent of the western limb of the great 

 syncline in that mountain range. 



The chief feature observable in Mr. Eyan's plan of the Forbes 

 Eeef Gold-mining Company's property. Fig. 1, and in the Sections, 

 Figs. 2 and 3, is the occurrence of a great syncline of various 

 schistose rocks in the Ingwenya Berg. This is ti-aversed by 

 Sections Z and T, from S.8.E. to N.N.W. (70,000 feet, about 13| 

 miles), and further to the south-west by the nearly parallel Section X 

 (on the Eyan Tin-mining Company's property), which repeats some 

 part of Section T, and reaches further to the west into the Transvaal 

 (see Fig. 1). 



Section Z (Fig. 2), reaching from the granitic hills on the S S.E. 

 border of the Forbes Eeef Gold-mining Company's property, passes 

 across the Ingwenya Berg, and is continuous on the N.N.W. with 

 the Section T (Fig. 2), which reaches the western limit of the same 

 property, conterminous with the Transvaal. 



Section T is continuous on the N.N.W. with Section Z, and meets 

 the Transvaal border at about 63,750 feet (about 12-j\- miles) from 

 the south-western angle of the Forbes Eeef Gold-mining Company's 

 property. 



Section X (Fig. 1), running west and east, is 65,625 feet (about 

 12| miles) south of Section T, and at an angle of 45° with it, and 

 parallel with a part of the south boundary of the Forbes Eeef Gold- 

 mining Company's property, which divides it from the Eyan Tin- 

 mining Company's property. 



Between Sections Z and T a narrow space, about 5,655 feet (more 

 than a mile) broad, on the N.N.W. half of the Ingwenya Berg and 

 passing nearly north and south, is coloured yellow and marked 

 " conglomerate " on Mr. Eyan's plan of the Forbes Eeef Gold-mining 

 Company's property (Fig. 1). This band corresponds with the 

 division c of Section T, about 5,000 feet broad (specimens Nos. 83- 

 96), belonging to the western limb of the local syncline. The 

 highest part of the Berg (6,321 feet) is a prominent part of the 

 eastern limb. This "conglomerate" evidently passes through the 

 southern boundary of the Forbes Eeef Gold - mining Company's 

 property. Its northern extent is not defined on the plan further 

 than 22,500 feet (about 4^ miles) north of Ingwenya Berg summit. 

 The division o of Section T consists of hard grit and breccia of lydite, 



