Reviews — Geology of the Cape of Good Hope. 323 



Geological Society on the publication of this work, which is not 

 only a tribute to the memory of one of the Early Fathers of 

 Geology, hut one which will be read and appreciated by all 

 interested in the history of the science. 



II. — Cape op Good Hope : Annual Eeport of the Geological 

 Commission for 1897. 



THE main features of the report for 1897 are the accompanying 

 map and sections. The map is on a reduced scale of 12-62 

 English statute miles to one inch, and shows the geology of the area 

 stretching from the west coast eastward to the Gamka Eiver, and 

 from the Zwarteberg Mountains on the north to some distance south 

 of the Langebergen. The map is clearly printed in colours, the 

 major faults being successfully represented by a narrow uncoloured 

 band. The structure of the area is illustrated by five horizontal 

 sections drawn across the intervening districts situated between 

 Worcester on the west and Ladisraith on the east. 



The report itself is marked by commendable caution, there 

 being an entire absence of the highly coloured descriptions so usual 

 in African geological literature. 



The Commission is to be congratulated on the amount of work done, 

 and the interest and importance of the results obtained. Especially 

 woi'thy of praise is the adherence to a plain statement of facts in 

 place of building up, on insufficient data, elaborate and fascinating 

 theories. 



The succession established by Bain and Dunn is in the main 

 adhered to, the formations in descending order being given as 

 follows : — 



Conglomerate, Gravels, Sands, and Limestone. 



Ecca Beds. 



Dwyka Series. 



Witteberg Beds. 



Bokkeveld Beds. 



Table Mountain Sandstone. 



(Marked unconformity.) 



Malmesbury Beds. 



Granite intrusive in Malmesbury Beds. 



The Malmesbury Beds cover wide areas round Hopefield and 

 Malmesbury, and are represented as forming a narrow strip north of 

 the gi'eat dislocation known as the Worcester-Eobertson Fault, 

 between Tulbagh on the north-west and Swellendam on the south- 

 east, and also a small triangular patch east of Ladismith and south 

 of the Zwarteberg. One of the greatest alterations from the 

 excellent map of Mr. Dunn is the withdrawal of the Malmesbury 

 Beds from the Caledon district, and the insertion of strata of 

 Bokkeveld age in their place, thus returning to the mapping of 

 A. G. Bain. The Malmesbury are considered to be the oldest I'ocks 

 seen at the Cape, the Namaqualand schists and gneiss of Mr. Dunn 



