125 Geological Remarks on the 



sides it is said to be bounded by the naked chalk-stra- 

 tiiin above meiuioned*. The Seine river enters the 

 basin of Paris near Mojitcrean, and quils it again near 

 Gisors ; its tributary rivers the I.oiiig enters it near 

 Nemours, the Marne at Espernuy ; and the Anne and 

 Oyse near Coivfj'iegfie, after having lor some distance 

 skirted its boundaries, pages 37, v30» 40 and 41. 



Picardy Province, to the north of Paris, is wholly composed 

 of chalk (tbrming the northern border of the basin 

 of Paris), having isolated patelics (or hummock??) of 

 sand upon it, (perhaps alluvia), p. 39 and 40. 



Kollehoise, on the banks of the Seine, has in the plastic or 

 potters' clay, fragments of bituminous wood : this 

 clay covers the chalk, and underlays the coarse lime- 

 stone, p. 44. 



Homainville, 4\ miles NE., has the marlcy strata that co- 

 ver the gypsum beds ; and in a white and friable cal- 

 careous stratum there, siliceous trunks of palm-trees 

 of large bulk, and lymncae and planorbcs shells are 

 found, similar to the species that now exist in our 

 marshes : at this place also freestone and sand are found 

 that contain the 14 kinds of fossils mentioned at 

 Grignon, and also balani shells, p. 51 and 54. 



Saint Qjr, 14 miles WSW., has the gypsum formation, but 

 no beds of plaster ; green marles accompanied by stron- 

 tian here prevail, p. 53. 



Saint Gcrmaiji, 12 miles NW., has coarse limestone quar- 

 ries and their accompanying fossil remains (as at Gen- 

 tilli/), and above these is a soft green bed with marks 

 of leaves and stalks of vegetables in its lower strata : 

 on this a freestone rock containing roundish venuses^ 

 campreys and numerous tubcrculatcd cerites, and above 

 that a thin hard stratum whose seams abound with 

 small long white striated tellines. p. 48. 



Sa'mt Germain Forest has certain parts of it covered by 

 flint gravel, p. 58. 



Saint Prix, 11 miles NE., has free-stone and sand strata, 

 that contain the 14 kinds of fossils mentioned at Grig- 

 von, and also balani t-hells. p. 54. 



Seraii, on the canal of Ourquc, has a deep excavation, made 



* \VliicH seems the same that once extended across the Channel \jp thft 

 .British shore, where it is now found, with local ijiterruptions, from tJielslc 

 iU Wight to the mouth of the 'thamesi gqc, vol. Wiiv. p. 310, 



in 



