46 la IB "V I IB -VsT s. 



♦ 



WOODWARDIAN MuSEUM, CAMBRIDGE. CATALOaUB OF THE FoSSILS 



IN THE Students' Strati graphical Series. By H. Woods, B.A., 

 F.G.S. 8vo. pp. 23. (University Press, 1893.) 



THERE is much to be said in favour of the plan, vrliicli has been 

 carried out at Cambridge, and also in some of the principal 

 University Museums in Germany, of forming for teaching purposes 

 a separate series of fossils to illustrate the principal types which 

 characterize the different stratigraphical horizons of the geological 

 series. This catalogue, which has been very carefully drawn up by 

 Mr. Woods, gives the generic and specific names, and the class and 

 order of the common typical fossils occurring in each of the principal 

 geological divisions in this country, ranging from the Lower 

 Cambrian to the Barnwell and Barrington gravels and peat, which 

 have been selected and arranged for the use of the students at 

 Cambridge. Altogether the names of 558 species are given, of 

 which 182 are from the Palseozoic, 290 from the Mesozoic, and 186 

 from the Tertiary rocks. As furnishing a highly useful key to the 

 leading fossils in our British rooks, this catalogue has a practical 

 value beyond the purpose for which it was designed. To allow of 

 notes and additions it has been interleaved with blank pages. 



I^:H]:poI^TS j^zsthd zF-i^ooEiDBiDiiTca-s. 



Geological Society of London. 



I._November 22nd, 1893. — W. H. Hudleston, Esq., M.A., 

 F.R.S., President, in the Chair. The following communications 

 were read : — 



1. "The Basic Eruptive Eocks of Gran." By W. C. Brogger, 

 Ord. Prof, of Min. and Geol. at the University of Christiania, 

 For. Memb. Geol. Soc. 



In previous communications the author has maintained that the 

 different masses of eruptive rock which occur within the sunken 

 tract of country lying between Lake Mjosen and the Langesunds- 

 fiord are genetically connected, and have succeeded each other in a 

 regular order. The oldest rocks are the most basic, the youngest 

 (except the unimportant dykes of diabase) are the most acid, and 

 between the two extremes he has found a continuous series. 



He is now preparing a detailed monograph on this series of 

 eruptive rocks, and in the present communication he gives an 

 account of the results of his work on the oldest members. 



Several bosses of basic plutonic rock, now forming a series of 

 dome-shaped hills, lie along a north-and-south fissure-line. The 

 most northerly is that of Brandberget in the parish of Gran, about 

 50 or 60 kilometres N.N.W. of Christiania, and the most southerly 

 occurs at Dignaes on Lake Tyrifjord, about 35 kilom. W.N.W. of 

 the same town. The prevailing rock in these bosses is a medium 

 or coarse-grained olivine-gabbro-diabase ; but pyroxenites, horn- 

 blendites, camptonites, labrador-porphyrites, and augite-diorites also 

 occur. Analyses of the typical rocks from three localities on the 

 north-and-south line are given, and the conclusion is reached that 



