246 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



feet. 



Bluish-grey clay 2 



Earthy lignite with petrified wood and^bones of reptiles 2 



Bluish-grey clay 2^ 



Very compact grey clay 10 to 16" 



The section at Bonvillers (p. 250), near Noailles, shows a mottled clay 

 above the lignites : — 



feet. 

 " Yellowish clay, mottled purple, with flint-pebbles ; it is sometimes en- 

 tirely red 7^ 



Green clay with broken shells, Ostrea, Cyrena, &c 2 



Bluish-grey laminated marl 6^ 



Earthy lignite mixed with clay If 



Ferruginous grey sand 4 



Hard lignite 1 



Grey compact clay , 1^ 



Lignite, petrified wood, and bituminous trunks of trees, nodules and beads of 



iron pyrites, remains of reptiles, &c 5^ 



Bluish-grey clay 16 



White sand." 



At Noailles and Abbecourt, the lignite series may in both eases be seen 

 in the slight cuttings on the sides of the lanes, overlying yellowish sands 

 without fossils at the top, but abounding with the ordinary Bracheux 

 shells lower down, and then the Chalk. M. Graves gives the following 

 section of the pit at Bracheux, near Beauvais (p. 188) : — 



feet. 



" Superficial soil 1^ 



Disturbed beds, with shell-debris 2 



Thin layers of OstrecB lying flat, with remains of fishes and broken shells ... 6| 



Irregular vein of iron-sandstone 0^ 



Bed of crushed shells, very abundant, replaced at places by a friable 



white marl 2\ 



Yellow sand containing a small number of perfect shells, especially CucuUaa 



and Venericardia , 2^ 



Finer sand with green grains — the same shells more numerous, but friable ... 2^ 



Bed of the crushed shells very abundant in the same sand 1 



Grey chloritic sands with entire fossils, not numerous, and flint-pebbles 



of all sizes 7^ 



Chalk, with its superficial bed of broken flints." 



There are no sections of the lower beds between the Dep*'. of the Oise and 

 Paris. The following is M. Chas. d'Orbigny's section of Meudon* near Paris, 

 which may serve as a type for the lower beds of that district, except that 

 the fossiliferous lignites and conglomerates, Nos. 6 to 8, are only of local 

 occurrence, — and that traces of the lignites and clays with fluviatile shells, 

 the equivalent of the above-described lignites and clays of the Soissonnais, 

 are occasionally found overlying the mottled clays (No. 10). 



No. feet. 



" Calcaire grossier 46 



Glauconiferous sands 2\ 



Plastic clay, red, grey, &c 6 to 26 



9. White marl, with calcareous nodules 1 



Lignite, with large PflZM£?ma and -(^wo</ow 1:^ 



Laminated clay, with selenite, iron-sandstone, &c Of 



Conglomerate with remains of Mammals, Reptiles, Fishes, 



marine and fluviatile shells, &c H 



Pisolitic limestone 6 



Chalk." 



* Bull. Soc. Geol. de France, vol. vii. p. 281. 



Calcaire 

 grossier. 



' 12. 

 11. 





r 10. 





9. 



Argile 



8. 



Plastique. 



7. 





6. 





3-5. 





1-2. 



