Reviews — Yorli^hire Geology. 275 



V. — Gkological Survey of the Transvaal. — In the volume of 

 Annual Eeports for 1910, part iv (1911), the Director, Mr. H. 

 Kj'naston, gives a general account of the field-work, with some 

 important particulars relating to building-stones, illustrated by twelve 

 pictorial views of quarries. Mr. E. T. Mellor contributes a Report on 

 "The Geology of a portion of the Central Witwatersrand ", with 

 a map showing the structure of the area; another Report is on " The 

 Geology of the Steelpoort River Valley, including the country round 

 Roos Senekal and Dullstroom ", by Mr. A. L. Hall, illustrated by 

 views, sections, and a coloured geological map ; a third Report is on 

 " The Geology of the Rustenburg and Zeerust Bushveld south of the 

 Dwarsberg", by Mr. W. A. Humphrey, and a fourth Report, by the 

 same geologist, is on " The Transvaal System west of the Klip River 

 Yalley ", both illustrated by coloured geological maps. 



VI. — ToRKSHiEE Geological Society. 

 QOME very interesting papers are contained in part iii (vol. xvii, 

 O N.S., 1911) of the Proceedings, issued in January last. The 

 Presidential Address is printed herein, and in this Professor P. F. 

 Kendal] deals with the Progress of Geology, with special reference to 

 Yorkshire, during the fifty-two years in which the Marquis of Ripon 

 (his predecessor) Avas President of the Society. An important paper 

 follows on " The Lower Oolites of Yorkshire", by Mr. L. Richardson. 

 The succession of beds at Blea Wyke, Ravenscar, is given ; but the 

 aalensis and moorei beds (between which the division line between 

 the Lias and Oolites is generally drawn) are absent at this locality. 

 The Dogger is found to rest upon a deeply-eroded surface of the Lias, 

 and hence the division line between the Lias and Oolites is usually 

 sharply defined. The subdivisions of the Oolites are considered in 

 detail, and the paper is illustrated by three fine photographs. Three 

 appendices follow, two by Mr. S. S. Buckman on the Ammonites (one 

 being a comparison of the Upper Toarcian Beds in Yorkshire and in 

 the Cotteswolds), and the third by Mr. Talbot Paris on the Echinoids. 



A beautifully illustrated paper is contributed by Mr. G. "W. Lamplugh 

 " On the Shelly Moraine of the Sefstrom Glacier and other Spitzbergen 

 phenomena illustrative of British glacial conditions", an abstract of 

 which was delivered at the Sheffield Meeting of the British Association, 

 1910 (Section C). The paper contains a note by Dr. A. Strahan and 

 a list of shells by Professor Gerard de Geer. 



Some interesting results of the careful collection and study of Chalk 

 Belemnites are presented by Mr. J. W. Stather. A complete transition 

 can be traced from Actinocamax ivestphalicus through A. granulatus to 

 A. quadratus, and the forms show a deepening of the alveolar cavity 

 as they are collected from successively higher Chalk. A convincing- 

 diagram accompanies the text, and this shows the actual depths of the 

 alveolar cavities of a series of specimens collected from the Upper 

 Chalk of Yorkshire, the exact measurements through 650 feet of Chalk 

 being given with each specimen. These results were first obtained 

 by M. de Grossouvre, and were confirmed by Dr. Rowe's researches in 

 the South of England. In Yorkshire, however, Mr. Stather is the 

 first to collect the complete series. 



