Reviews — Geological Survey of England and Wales. 269' 



of which the more numerously represented are Hoplites, Crioceras, 

 Ancyloceras, and Neumayr's Olcostephanus (or Holcostephanus) , with 

 its subdivisions Craspedites, PolyptycJiites, Astieria, and Simhirskites, 

 proposed by Professor Pavlov, the author following the late Professor 

 Hyatt in regarding Pavlov's divisions as of generic importance. A 

 very large proportion of the species are new ; but there are'no new 

 genera. 



For this valuable contribution to our knowledge of the fauna of 

 these beds in North Germany, Professor v. Koeneti deserves the 

 hearty thanks of all, and especially of those who are more particularly 

 interested either in the Lower Cretaceous rocks as a whole or in 

 their Cephalopod fauna, and we are sure that many will look 

 forward with eagerness to the appearance of the second part of 

 this excellent monograph. 



II. — Memoiks of the Geological Survey of England and 



Wales. 



IT is again our pleasant task to call attention to the work of the 

 Geological Survey, and to offer our congratulations to the 

 Director, Mr. J. J. H. Teall, F.E.S., and to the Board of Agriculture, 

 under whose auspices the publications of the Survey Memoirs now 

 appear, upon the excellent series recently presented to the public. 

 1.— The Geology of the South Wales Coalfield. Part III: The 

 country around Cardiff, being an account of the region comprised 

 in Sheet 263 of the Map. By Aubrey Strahan, M.A., F.G.S., 

 and T. C. Cantrill, B.Sc. 8vo ; pp. vi and 148, with 13 text 

 figures. (London : E. Stanford (or of Messrs. Dulau & Co., 37, 

 Soho Square, W.), 1902. In paper wrapper, price 2s. 3c?.) 

 The district of the South Wales Coalfield is one with which 

 Mr. Strahan is specially acquainted, and this third memoir upon it 

 forms the explanation to Sheet-map No. 263. The area was originally 

 surveyed, about the year 1840, by Sir H. T. De la Beche, with 

 the assistance of Mr. W. T. Aveline,^ but additions, chiefly in the 

 Secondary rocks, were made in 1872 by H. W. Bristow and 

 H. B.Woodward. The re-survey on the six-inch scale was carried out 

 during the years 1892-6, under the superintendence of Mr. Strahan, 

 the author of this memoir, who himself surveyed the greater part of 

 the sheet, while Mr. Cantrill was engaged upon the western part, 

 and has supplied the descriptions of the area surveyed by himself. 



The oldest strata, consisting of Ludlow and Wenlock rocks, come 

 to the surface near Cardiff in the axis of a great anticline of pre- 

 Triassic age. Their existence was first detected by the Rev. Norman 

 Glass in 1861, but it was not until 1879 that their extent and 

 age were placed beyond doubt by Professor W. J. Sollas. Much 

 information concerning them was obtained at a later date also by 

 Mr. John Storrie. 

 The Old Red Sandstone presents the same general features as in 



1 An obituary notice of this veteran geologist will be found on pp. 285-286 of the 

 present Magazine. 



