Revietcs — Geology of Cape of Good Hope. 185 



V. — Cape of Good Hope, Department of Ageicttlttjee. 



The Tenth Annual Eepokt of the Geological Commission. 8yo ; 

 pp. 296. Cape Town, 1906. 



The Eleventh Annual Repokt of the Geological Commission. 

 8vo; pp. 176. Cape Town, 1907. 



Colouk-peinted Geological Maps on the scale of 3 '8 miles to 1 inch. 

 (1 : 238,000):— Sheet 2, Swellendam-Eiversdale, 1907; Sheet 4, 

 Malmesbury-Ceres, 1906; Sheet 45, Postmasburg (Griqualand 

 West), 1907 ; Sheet 46, Barkly West, 1907. Published by the 

 Geological Commission, Cape Town. Price 2s. 6(?, each. 



ri"lHE Reports embody the results obtained by a vast amount of 

 1 arduous field-work, often carried on in districts where food and 

 ■water are scarce, rivers are broad, choked with sand, and fordable only 

 at wide intervals, and where travelling is limited to a short season. 

 Under these hampering conditions it is surprising to find how much 

 solid work has been accomplished. Of the actual extent of the area 

 described we find no precise statement in the Reports, but incidentally 

 we read of the survey of 6,000 square miles by one geologist in one 

 season. To the field-work must be added the preparation of the 

 reports and maps, and the task of seeing them through the press — 

 work apparently accomplished by Mr. A. W. Rogers (the Director) and 

 Mr. A. L. du Toit without clerical assistance. The Survey indeed may 

 be characterised as one yielding a maximum result at a minimum cost. 



The Report for 1905 contains an account of the Geology of parts of 

 the divisions of Uitenhage and Alexandria by Mr. Rogers, with a map 

 and 6 diagrams; of the coastal plateau in the divisions of George, 

 Knysna, Uniondale, and Humansdorp, by Mr. E. H. L. Schwarz, with 

 a map and 15 illustrations; of Glen Grey and parts of Queenstown 

 and Wodehouse, including the Indwe area, by Mr. du Toit, with a map 

 and 7 diagrams ; of parts of Hay and Prieska, with some notes on 

 Herbert and Barkly West, by Mr. Rogers, with a map and 5 diagrams ; 

 of portions of the divisions of Yryburg and Mafeking, by Mr. du Toit, 

 with a map and 4 diagrams ; of the Divisions of Tulbagh, Cei'es, and 

 "Worcester, by Mr. Schwarz, with 16 illustrations (on field-work 

 mainly done in 1896) ; and a short account of a raised beach deposit 

 near Klein Brak River, by Mr. Rogers, with a plan. 



The Report for 1906 contains an account of the Geology of parts of 

 Bechuanaland and Griqualand West, by Mr. Rogers, with 12 figures; 

 of the eastern portion of Griqualand West, by Mr. du Toit, with 

 13 figures. 



Among some of the many and interesting results obtained attention 

 may be directed to the discovery by Mr. Rogers of undoubted glacial 

 conglomerates among rocks so ancient as the Griquatown Series ; to 

 the occurrence of the Blink Klip Breccia in Hay ; and to the account 

 of the diamond pipes of the Kimberley area by Mr. du Toit. 



The two Reports deal with almost every formation known in Cape 

 Colony, from the oldest up to the newest. Much work was carried 

 on among the unfossiliferous rocks, older than the Table Mountain 

 Sandstone. The reader is therefore mercifully spared long lists of 

 fossils and of finding old friends under changed names. 



