18 GEOLOGY. 



Hudleston, W. H. The Yorkshire Oolites. Part II. The Middle 

 Oolites. Introduction and Section T. Froc. Geol. Assoc, vol. iv. 

 no. 6, pp. 353-410, pi. iv. (map and sections). 



Describes rocks from Cornbrash downwards, in the following order : — 

 Shales, with Avicula echinata ; Kelloway Rock ; Oxford Clay ; Lower 

 Calcareous Grit. The following sections are more fuUy described : — 

 Castle Yard and Hill, Scarboro' (Coralline Oolite to Kelloway Rock) 

 Filey Brigg (Lower Calcareous Grit, wdth Low^er and Upper Passage 

 Beds). List of Fossils and notes on Mineral Composition are given 

 and the rocks are correlated with those of other districts. W. T 



Excursion to the Gorge of the Med way, and Kits Coty House 



Excursion to Pleading. Excursion to Swindon and Eariugdon 



Proc. Geol. Assoc, vol. iv. no. 8, pp. 503-505, 519-523 ; no. 9 



pp. 543-554. 



Notes the Gault and Chalk Marl of Aylesford ; gives notes of a lecture 



by Prof. J. Morris, on the Denudation of the Weald. Prof. T. R. Jones 



described the " Bottom Bed" of the Tertiaries and its junction with the 



Chalk, the clay-galls of the sand, &c. 



Mr C. Moore and Prof. J. Morris described the Purbeck, Portland, 

 and Upper Kimmeridge Clay of Swindon ; Mr. C. J. A. Meyer, Mr. E. 

 C. Davey, and Prof. Morris the Sponge -gravels (L. Greensand) and 

 Corallian Limestones of Faringdon. W. T. 



Hughes, Prof. T. McK. Notes on the Classification of the Sedi- 

 mentary Rocks. Bep. Brit. Assoc, for 1875, Sections^ pp. 70-73. 



Advocates revision of the present classification, which is often incon- 

 sistent. The " Epochs " proposed are : — Laurentian, Labrador Series, 

 Huronian(?), Cambrian, Silurian, Carboniferous, New Red, and Jurassic, 

 with gaps between each. The rocks of G t. Britain and Scandinavia older 

 than Cambrian must be called simply " pre-Cambrian," there not being 

 evidence to identify them with any of the American groups. Except 

 in connexion with volcanic deposits, no break has been proved betw^een 

 the base of the Harlech group and the top of the Bala Series, all of 

 which is Cambrian. The base of the Silurian is the base of the May- 

 Hill Sandstone (L. Llandovery) ; a great part of the Old Red Sand- 

 stone of South Wales is taken in the Silurian. The term Permian is 

 dropped, the rocks so called being restored to Sedgwick's division of 

 Lower New Red. The most important gap in Britain (possibly with 

 the exception of some of pre-Cambrian age) is that between the Silurian 

 and Carboniferous ; next to this comes that between the Carboniferous 

 and New Red. Reference is made to Sedgwick's classification, which is 

 defended against the alterations proposed by Murchison. W. T. 



Hull, Prof. Edward. Notes on the Structure of Haulbowline Island, 

 Cork Harbour ; and on the Geological Age of the Flexures of the 

 Strata in the S.W. of Ireland. Journ. U. Geol. Soc. Ireland, ser. 2, 

 vol. iv. pt. iii. pp. 1 11-114. 



Haulbowline, opposite the mouth of the river Lee, is composed of a 



