702 ME. E. H. EASTALL CW THE GEOLOGY OF [Nov. I9II, 



references to the geology are scattered through the Annual Reports 

 of the same Commission. The most important publications on the 

 geology of this region are enumerated below. 



Bibliography. 



Bain, A. G. ' On the Geology of Southern Africa ' Trans. Geol. Soc. ser. 2, vol. vii 



(1856) pp. 175-92. 

 Bain, Thomas. ' Notes on the Geology of the Western Districts ' Cape Monthly 



Magazine, ser. 2, vol. xv (1877) pp. 171-78. 

 Dunn, E. J. Geological Sketch-Map of Cape Colony. London, Stanford, 1873. 



. Geological Sketch-Map of South Africa. Melbourne, 1887. 



Hatch, F. H., & Coestoephine, G. S. 'The Geology of South Africa' 2nd ed. 



London, 1909. 

 Rogees, A. W. ' Summary of the Work done in the South- Western Districts ' 



1st Ann. Rep. Geol. Comm. Cape Colony, 1896, pp. 13-14. 

 Rogees, A. W., & Schwaez, E. H. L. ' Report on Caledon, Bredasdorp, Swellendam, 



& Southern Fart of Worcester ' Ann. Bep. Geol. Comm. Cape Colony, 1898, 



pp. 37-54. 

 . ' Notes on the Geology round Worcester supplementary to the Accounts 



published in the 1st & 2nd Annual Reports ' Ibid. pp. 83-84. 

 Bogees, A. W., & Du Ton, A. L. ' An Introduction to the Geology of Cape Colony ' 



2nd ed. London, 1909. 

 Btjbidge, B. N. 'On -some Points in the Geologv of South Africa' Q. J. G. S. 



vol. xv (1859) pp. 195-98. 

 Schwaez, E. H. L. ' Summary of the Work done in the Tulbagh Area & 



Worcester District ' 1st Ann. Bep. Geol. Comm. Cape Colony, 1896, pp. 27-29. 

 . [Quoted in] Beport of the Geologist. 2nd Ann. Bep. Geol. Comm. Cape 



Colony, 1897, pp. 3-38 & pi. ii, sections 1 & 2. 

 . ' Summary of Work done during 1897 in the Bobertson, Lady Grey, 



Montagu, & Eastern Parts of the Swellendam District ' Ibid. App. II, 



pp. 53-58. 

 . ' Geological Survey of the Divisions of Tulbagh, Ceres, & Worcester ' 10th 



Ann. Bep. Geol. Comm. (Jape Colony, 1905, pp. 259-90. 



II. Geneeal Geological Stetjctuee. 



Within the area here dealt with a considerable variety of 

 geological formations is found, ranging from the pre-Cambrian 

 to the Cretaceous, but with notable and important gaps in the 

 succession. There is, in addition, a considerable development 

 of gravels, loams, and alluvium of recent origin. The most 

 important formation, and the one which covers the greatest area 

 in the district, is the Cape System ; while in certain parts f the 

 strata of the Karroo System also occur to a considerable extent. 



The formations now actually seen in the district may conveniently 

 be tabulated as follows : — 



Recent gravels and loams. 



Enon Conglomerate, etc. Lower Cretaceous. 



Permo-Carboniferous. 



Ecca Shale. 



Dwyka Series. ) 



Witteberg Series. Devonian and Carboniferous. 



Bokkeveld Series. Lower Devonian. 



Table Mountain Series. Lower Devonian or Silurian. 



Malmesburv Series. Pre-Cambrian. 



