AND THE PHOSPHATIC BEDS NEAR MONS, 



327 



The deposit of White Chalk of IsTouvelles is formed of very pure 

 white chalk, containing from 98 to 99 per cent, of carbonate of Hme. 

 Nodules of black flint are of frequent occurrence. The principal 

 fossils met with are : — 



Belemnitella mucronata, Schl. 

 Ostrea vesicularis, Lamk. 

 Pecten cretosus, Defr. 

 Terebratula carnea, Sow. 

 Magas pumilus, Sow. 



Khynchonella octoplicata, Sow. 



subplicata, D'Orb. 



Echinocorj's vulgaris, Breyn., var. ovata. 

 Ofiaster pilula, David. 

 Micraster Brongniarti, Heb. 



M. Briart and I have correlated the Chalk of Nouvelles with the 

 Chalk of Meudon of French geologists. 



It is useless for the purpose of this paper to describe the beds 

 which underlie the White Chalk of Nouvelles ; I shall, however, 

 give the details of the strata which overlie it. For this purpose I 

 will make use of the Section fig. 2, which is the exact representa- 

 tion of the beds uncovered in the quarries between Mesvin and 

 Ciply. 



Fig. 2. — Section near Ciply and Mesvin. 

 (Vertical scale 1 : 2000 ; horizontal scale 1 : 4000.) 



N. S. 



There occur successively in descending order : — 



A. Quaternary Strata. — Loam adapted for brick-making overlyiug- 

 sandy loam, below which sand with gravel is often met with. 

 In this gravel flints worked by man have been found, and 

 numerous fossil bones, belonging chiefly to — 



B. 



Elephas primigenius. 

 Rhinoceros tichorhinus. 



Equus caballus. 

 Cervus elapbus. 



Tertiary Strata. — Lower portion of the Landenian system of 

 Dumont, corresponding with the Thanet Sands of English 

 geologists. It is composed of glauconifcrous sands, the upper 

 part of which is loose, while the lower is very argillaceous and 

 compact. The following fossils are found in it — 



Gastornis Edwardsii, Lemoine. 

 Pholadomya Koninckii, Nyst. 

 Cyprina Morrisii, Sow. 



At the base of the bed B a pebbly deposit is often found containing 

 flints, well rounded and mixed with nodules, sometimes very large, 

 of the same substance, and evidently derived from the destruction 

 of the Cretaceous strata. This deposit rests upon the Cretaceous 

 series (E) in the quarry where the section, fig. 2, was taken ; but 



aJ.G.S. No. 167. 2 a 



