Reviews — Prestwich's Index Guide to the Geol. Collections. 183 



In comparison with these north-country sections, the Welsh- 

 English series, taken generally, offers : — 



feet. ( Upper or Ardwick series. 



ifeet. I Upper or Ardwick series. 

 Coal-measures. . 10,000 < Middle or Pennant series. 

 ( Lower or Gannister series.^ 

 Millstone-grit... 1,000 

 T i r, ^ -r CI. Up. Limestone -shale or Yoredaleseri 



Lower Carboniferous ^^ Mountain, Scar, or Great Limestone, 



tarbomferous. ( Limestone . . 1,500 ( ^ ^ower Limestone -shale. 



12,500 

 Of course, the question as to how far the whole series of the two 

 regions, or members of the series, may be conterminous and con- 

 temporaneous, or merely analogous and homotaxeous, is not regarded 

 in this notice. 



I2,:E"V"IE^WS. 



An Index Guide to the Geological Collections in the University 

 Museum, Oxford. By Professor Prestwich, M.A., F.R.S., etc. 

 (Oxford, Clarendon Press, 1881.) 



SINCE the "Notices of Eocks and Fossils in the University 

 Museum," by the late Prof. Phillips, which has long been out 

 of print, many additions have been made, portions of the collection 

 re-arranged, and a large number of specimens have been carefully 

 named and located, so that a new and thoroughly revised catalogue 

 was essentially requisite, and this has now been supplied by Prof. 

 Prestwich. Without giving too much detail, or troubling the reader 

 with an array of specific names, this guide gives a general account 

 of the arrangement adopted, in which the author has endeavoured 

 to show, besides the position of the specimens in the Museum, their 

 relative place in systematic classification and geological age. The 

 order in which the collections are described is (1) the Eocks and 

 their constituents, and (2) the Organic remains or the Paleeonto- 

 logical portion. The former include the chief building and 

 ornamental stones of the British Islands (of which the use in 

 the Museum itself furnishes a good example), as well as notices of 

 other Igneous, Metamorphic, and Sedimentary Eocks ; a table 

 showing the succession of the last in the British area is given 

 at p. 21. A brief description of the classification of the minerals 

 concludes this part. 



The second portion treats of the general paleeontological series 

 of the Palaeozoic and Secondary strata, and of the Tertiary and 

 Quaternary rocks and fossils (pp. 25-48), together with descrip- 

 tions of the local collections of the typical fossils of the Oxford 

 district (pp. 49-58), as well as of the collections illustrative of 

 the range and variations in time of particular classes of fossils, 

 and to which the diagram at p. 64 is a valuable supplement, as 



' In his memoir " On the Classification of the Carboniferous Series" (Quart. 

 Journ. Geol. Soc. vol. xxxiii. pp. 613, etc.), Prof. E. Hull gives his reasons for 

 grouping the Gannister, Millstone, and Yoredale series as the Middle Carboniferous, " 



