Revieios — Geological Report of Cape of Good Hope, 227 



district this typical Midland coalfield is not so well known as 

 the excellence of the sequence and preservation of its organic 

 contents warrant. The chart by Messrs. Hind and Stobbs should 

 draw attention to this region, for besides being of use_ to the 

 mining student it will be found to be of more than local value, 

 and should be studied by all interested in the Coal-measures, 



The chart gives the order of sequence, distance apart, and 

 synonyms of the seams of Coal and Ironstone of the Pottery and 

 Cheadle Coalfields, in two sections drawn on a scale of 200 feet 

 to the inch. The fossil shells distinctive of or especially abundant 

 on certain horizons are drawn opposite to the particular bed in 

 which they occur. No attempt has been made to subdivide the 

 Coal-measures beyond the use of merely local terms for the higher 

 portion of the sequence. Marine organisms are represented as 

 occurring on three horizons— at the base, near the middle, and 

 towards the summit of the coal -bearing strata. A noticeable 

 omission, evidently due to extreme caution, is the band, rich in 

 marine organisms, found many years ago by Mr. John Ward above 

 the Gin Mine at Longton. Thin limestones with Spirorhis, so long 

 held to be distinctive of the higher Coal-measures, are represented 

 at two horizons low in the sequence. The fossils are clearly drawn, 

 while their selection by Dr. Wheelton Hind guarantees that the 

 typical forms have been chosen. 



The authors have evidently taken great care in planning and 

 drawing up the chart : it is to be hoped the Mining Institutes in 

 other coalfields will follow the example of that of North Stafford- 

 shire by publishing similar charts, and thus show that they recognize 

 the close union of the two sciences of Mining and Geology. 



Walcot Gibson. 



II. — Cape of Good Hope. Annual Eepoet of the Geological 

 Commission, 1900. 4to ; pp. 93. (Richards & Sons, Cape 

 Town, 1901.) 



I. The results of the survey of parts of the Uitenhage and Port 

 Elizabeth districts (pp. 1 to 18). The Sunday's River Marine 

 Beds, the Wood-bed series, and the Enon Conglomerate series 

 ■constitute the great Uitenhage series ; and these were studied in 

 the Zwartkop Valley, the Bezuidenhout Valley, and on the White 

 River and the Sunday's River. The fossil fauna and flora are 

 referable to both the Jurassic and the Cretaceous series ; and are here 

 provisionally regarded as Upper Jurassic. The occurrence of much 

 more recent deposits near the coast are alluded to. The observations 

 made by earlier geologists on the district are carefully noted. 



II. (Pages 19-54.) A survey of parts of Clan william, Van Rhyn's 

 Dorp, and Calvinia divisions led to the definite recognition of 

 a separate series of sedimentary rocks (shales, sandstones, vein- 

 quartz, quartzite, limestone, and conglomerate) underlying the 

 Table Mountain Sandstone, and resting on the Malmesbury series. 

 The conglomerates are decidedly glaciated, and much resemble 

 those of the Congo in Oudtshoorn in some respects. The sandstones, 



