Bibliographical Notices. 93 



of tho coal-growths, the existence of a Devonian flora, and the occur- 

 rence of fossils in the Lower Palseozoic rocks. His comparison of 

 the old rocks of the Canadian regions with those of other parts of 

 the world, in the Table at p. 92, is very interesting and suggestive. 

 From the Ludlow beds downwards to the older gneisses of Scotland 

 and Scandinavia, including the lately recognized Pebidian and 

 Dimetian series, Dr. Dawson finds probable equivalents, of definite 

 characters and position, in Canada and its vicinity. 



The new edition of his work, with its well-considered additions, 

 will prove to be valuable to the increasing population of British 

 America, in the presence of the enlightenment of modern education, 

 and the necessity of understanding the nature and whereabouts of 

 the mineral productions of the rocks and the capabilities of the soil. 



The Gault, being the Substance of a Lecture delivered in the Wood- 

 wardian Museum, Cambridge, 1878, and before the Geologists' 

 Association, 1879. By F. G. Hilton Price, F.G.S. 8vo, 

 81 pp. Taylor and Francis, London, 1879. 



In this very useful history of the Cretaceous division of strata 

 known as "the Gault," the author gives a special description of tho 

 Gault at Folkstone, bed by bed (pp. 10-23); a more general 

 account of this formation as seen at the exposures along its outcrop 

 in the various counties from Kent to Devonshire and Yorkshire 

 (pp. 21-34) ; and a sketch of the Gault in France (pp. 34-42). 

 The Greensand of Blackdown, the "Bed Chalk" of Norfolk and 

 Yorkshire, tho various phosphatic and other nodular beds, and the 

 results of the deep borings penetrating the Gault near London are 

 specially noticed. An extensive and synoptical catalogue of the 

 fossils (pp. 44-81) shows their occurrence at different localities and 

 their range through the several zones of the Gault. 



Besides thus indicating the geographical range of this important 

 formation in England and France, and correlating the equivalents 

 of the eloven zones which he recognizes in tho Gault of Copt Point, 

 Folkestone, the author has in view a hydrographical sketch of the 

 area in which this important Cretaceous formation was deposited 

 (pp. 8, 9). He notes that its composition varies much in different 

 localities, according to the depth of water and the nature of the 

 adjacent lands at the time of the deposition of its component parts ; 

 also that the fauna varied in the several regions according to the 

 nature and conditions of chango in the water and sea-bed. Fur- 

 ther, he observes that the clays and sands of the Gault originated 

 in the trituration of lands and cliffs composed, for the most part, of 

 Jurassic and Neocomian rocks in what is now England, on the west 

 side of the Anglo-Parisian Cretaceous basin, of Primary (Palaeo- 

 zoic) rocks in the north-east of the basin at the Ardennes, and of 

 granites, porphyries, Jurassic, and Neocomian rocks on tho east and 

 south-west sides of the basin. 



A careful list of books and memoirs treating of the Gault and its 

 fossils is given at pp. 1-7. 



