Revietvs — Cornet ^^ Briart'' s Divisions of the White Chalk. 469 



Tlie angles are sharp, but unbroken. There were a few "fossils in 

 the Draughton Limestone, and these were distorted like the rest of 

 the rock, which sufficiently disproves the notion that the rocks were 

 in a soft state when the beds were disturbed. 



Mr. Miall has made a series of experiments on Limestone Eocks, 

 which prove that they are both elastic and plastic ; and that sharp 

 unbroken contortions indicate a molecular re -arrangement which has 

 been produced by causes slow and long-continued in their action. 



Mr. W. H. Dalton, of the Geological Survey of England, con- 

 tributes an interesting paper on the Geology of Craven, referring 

 more particularly to the rocks occurring within the basin of the Aire. 

 He gives a general account of the Silurian Slates, Carboniferous 

 Limestone, and Millstone Grit, pointing out the most instructive 

 sections of each rock. 



Mr. Miall read a short paper on the Formation of Anthracite, 

 which is published in abstract ; and another on the Structure of ; 

 Ganoid Fishes, introductory to an account of the Ganoid Fishes of 

 the Yorkshire Coal-field. 



In the Minutes of proceedings there is an address by Mr. John 

 Brigg, J.P., on the Geology of the neighbourhood of Keighley. 



laZE^VIZBAATS 



I. — "■ Sub la division de l'etage de la Craie blanche dij 

 Hainaut en quatke assises." Par MM. F. L. Cornet et A. 

 Beiakt, ingenieurs civils. Extracted from vol. xxxv. of the 

 " Memoires couronnes et memoires des savants etrangers." (Pub- 

 lished by the Koyal Academy of Sciences, etc., of Belgium, 1870.) 



WHEN, some years ago, the authors of this paper made the de- 

 scription of the Cretaceous Eocks of Hainault the subject of 

 a detailed memoir, they were unable to assign any divisions to the 

 fifth and most important formation of the series — the White Chalk. 

 Since then, however, renewed investigations on their part, aided by 

 new sections which had not before been available, have led Messrs. 

 Cornet and Briart to consider the White Chalk of Hainault as being 

 divisible into four distinct members, the local character of which at 

 the same time the present paper seems to establish. 



In this part of Belgium the White Chalk rests upon the denuded 

 surface of what is known there as "gris" by the miners, the " Craie 

 glauconifere " of foreign geologists. Its upper limit is marked by 

 the appearance of the Brownish Chalk of Ciply, which is regarded 

 as the representative of the lowest of the Maestricht beds. 



Immediately below this comes the uppermost of our authors' 

 divisions of the White Chalk, to which they have given the name of 

 Craie de Spiennes. It consists of White Chalk tinged with grey, 

 rough to the touch, and with an almost gritty fracture. It is 

 irregularly stratified in thick and generally unbroken beds. It 



