120 ^ideological Remarks on the 



pf solid calcareous marles, that contain course crystals 

 : , pi lentkular yellowish gypsum ; and with very scaly 

 argillaceous niarlcs that contain nienilite silcx. The 

 middlcfniass has thicker and more numerous beds of 

 gypsum, the intervening solid calcareous marles have 

 in them numerous coarse crystals of lenticular yellow- 

 ish gypsum : some pF these beds, those that are 

 marbled with gray and are compact and argillaceous, 

 are used lor scouring- stones (not building). It con- 

 tains scattered nodules {rognojts) of gulphated strontian 

 ill its lower beds ; and it is chiefly in this mass that 

 fossil fish (not shcll-fish) arc found, 

 ^he upper mass is very thick, diiefiy of beds of gyp- 

 sum, interlaid with a lew marley strata : its lower 

 beds of gypsum are intermixed with siliceous masses, 

 its middle beds are columnar, and its upper gypsum 



, beds are usually interlaid with five strata of m^rle : this 

 upper gypseous mass contains astonishing collections 

 of the skeletons of birds, of quadrupeds, niammiferae, 

 and fish, tortoise bones, and a few shells, agreeing 

 with those of the fresh-water fish of our lakes. A 

 large mass of marles occur above these, imbedding dif- 

 ferent fossils (for which I must refer to page 31 and 52, 

 to the Section, and to what follows herein). 

 Above thcs.e marles, freestone and sand here occnr, that 

 contain the 13 kinds of fossil remains, menticmecl at 

 Gentilli/f Meudon and Grignon, with the additioii of 

 balani shells, pages 37, 50, 51, 52, 54 and 55, 



Montmorency^ 10 miles NE., has the upper mass of gyp- 

 sum, and its fossils (see Montmartre) forming the 

 surface, in s.ome parts";, in others, it has above the 

 gypsums and marles, the freestone and sand which 

 contain the 14 kinds of fossil remains that are found 

 on Montmartre &c. p. 50 and 54. 



MoJitereau, 22 miles SE., is at the south-eastern edge of 

 the basin of Paris described by our authors, and ad- 

 joins the great chalk districts in Champagne : gray 

 potters' clay is here dug, upon the chalk, p. 39 and 44, 



Montfort, 18 miles VV., is near the western edge of the 

 basin of Paris*, p. 39. 



"Mont Valerian , has plaster quarrier*. near tlie 



edge of the gypsous district, where only tb^ first or 

 upper mass of gypsum appears, p. 53. 



Morel, in Dreux Forest, has pits of very white potters* 

 (or pipe-)clay; it covers the chalky and is withoul. fo3- 



- . sils. p. 44. 



Nanlerrcy 



