Notices of Memoirs — Various Short Notices. 217 



fpetroleum, and subsequently for water which carried the oil and oil 

 residues from the intrusions. The author concludes with a very full 

 nummary of the literature of Clastic Dikes. 



2. Dr. F. H. Hatch has written a brief description of " The 

 Boulder Beds of Ventersdorp, Transvaal " (Trans. Geol. Soc. 

 S. Africa, vi, 95, 1904). The boulder ('banket') beds consist of 

 pebbles and large masses of slate, conglomerate, and quartzite, 

 identical with rocks occurring on the Eand and belonging to the 

 Witwatersrand Beds ; and they include also various igneous rocks. 

 Some of the banket boulders have been found to contain gold in 

 payable quantity, but these occurred amid many non-auriferous 

 masses, the fact being that the boulder beds have been derived 

 chiefly from the Witwatersrand Beds upon which they rest uncon- 

 formably. Dr. Hatch remarks that the boulder beds include not 

 only conglomerates but igneous breccias, and the formation appears 

 to have been initiated by the outpouring of vesicular lavas known as 

 the Klipriversberg Amygdaloid. For the group he applies the term 

 ■" Ventersdorp Beds." 



3. " The Geological History of the Gouritz Eiver System " is the 

 title of an essay by Mr. A. W. Rogers (Trans. S. African Phil. Soc, 

 xiv, 375, 1903). This river system drains the country southwards 

 from theNieuweveld Eanges, and the principal rivers, after crossing 

 a broad tract of less elevated ground, traverse in succession the 

 mountainous tracts of the Zwartebergen and Langebergen, The 

 Author describes the physical changes to which the area has been 

 subjected, and which have led to the present drainage system. 



4. An Index to Geological. Papers. — Many valuable papers on 

 the geology of Devonshire are scattered through the first thirty-four 

 volumes of the Transactions of the Devonshire Association for the 

 Advancement of Science, etc. Vol. xxxv (1903) contains a con- 

 tinuous alphabetical index to these, by Mr. J. G. Hamling, who has 

 placed each paper under three headings, viz., subject, locality, and 

 author. Geologists will be grateful to the compiler, and it is only 

 because he asks for intimation of any mistakes or omissions that we 

 venture to suggest the desirability for an extension of the subject 

 entries ; for example, there are only eight entries under ' Caverns ' 

 and only eight under ' Fossil,' although the number of papers dealing 

 with those subjects is vastly greater. 



5. " Devonshire in the time of the Lower Chalk " is the title 

 of a paper by Mr. Jukes-Browne (Trans. Devon Assoc, xxxv, 787, 

 1903). An accompanying map shows the probable geography of 

 the south-west of England and north-west of France in the 

 Cenomanian (Lower Chalk) age. Exmoor is represented as an 

 island, while the country south-west of Tintagel and Dartmoor is 

 regarded as part of "the Western Land" connected with Brittany 

 and Normandy. 



6. In another paper on " The Geology of the Country around 

 Chard " (Proc. Somerset Arch, and Nat. Hist. Soc, xlix, 1903) 



