AND THE PHOSPHATIC BEDS NEAR MONS. 329 



la Malogne has been given." Several attempts to work the phos- 

 phate of lime had soon to be abandoned on account of the irregu- 

 larities of the bed. 



This conglomerate of Malogne has been proved to be extremely 

 rich in fossils at certain spots in the neighbourhood of Ciply ; but 

 the most abundant species are found also in the Tufaceous Chalk, or 

 in the brown phosphatic chalk which I am about to describe *. 



D. Brown Phosphatic Challc of Ciply. — It may be described in 

 three subdivisions, which are : — 



<7\ Calcareous rock of coarse texture, whitish, rough to the touch, 

 somewhat friable, and stratified in regular beds. There are a 

 few continuous beds of grey flint. The upper strata consist 

 almost entirely of carbonate of lime. Eelow there are beds in 

 which brown phosphatic grains appear mingled with some 

 grains of glauconite. The quantity of phosphate increases in 

 going deeper, and thus we arrive, without any sudden transition, 

 at the veritable brown phosphatic chalk. Total thickness 

 from 20 to 30 feet. 



The fauna of the beds cV is the same as that of the lower 

 deposit, fP. Some species, however, occur there in greater abund- 

 ance. I may name, amongst others, Thecidea papillata, relatively 

 rare in d~ and (Z'\ but abundant in d^. 



d^. Coarse-grained calcareous rock of a very pronounced greyish- 

 brown colour, rough to the touch, somewhat brittle, stratified 

 in regular beds, but in which the grey flints are rare. It is 

 composed of a mixture of carbonate and phosphate of lime. 

 This latter enters into the composition of very small brown 

 grains, scarcely visible to the naked eye. 



According to M. Peterman's analyses, this rock has the following 

 composition t: — 



Organic matter 2-83 



Lime 53-24 



Magnesia 0'12 



Oxide of Iron and Alumina I'Dl 



Potashand Soda 0-19 



Carbonic acid 2810 



Sulphuric acid 089 



Phosphoric acid ll-()6 



Silica and Sand l-9() 



Fluorine and Chlorine trace.^ 



100-00 

 I would call attention to the large proportion of nitrogenized 



* Most of the Cretaceous fossils of Ciply ^rhich are in the pubhc col- 

 lections of England and France were derived from the Conglomerate beds 

 of Malogne. 



t BulL Acad. Eoyale de Belgique, 2^ s6r. vol. xxxiz. 



2a2 



