100 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



grossier from its most distant point to that place where it approaches 

 nearest to the Enghsh area, and see whether the changes in dimen- 

 sions, ill organic remains, and in mineral characters, which take place 

 on the same horizon in the several divisions as they range towards this 

 country, are of snch a nature that, if continued through the inter- 

 vening break, they would result in inducing characters similar to 

 those which actually obtain at Bracklesham and in the Isle of AVight. 

 1. To commence with the lowest or 1st division of the Calcaire 

 grossier. This glauconite-bed is either not developed, or is in a very 

 rudimentary state, on the boundary of the Tertiary area in Cham- 

 pagne ; but as it trends westward it becomes more developed, and, in 

 the central parts of the departments of the Marne and of the Aisne, 

 attains a thickness of 6 to 10 feet, whilst nearer the department of 

 the Oise it swells out in places to 25 and 30 feet. Of this division 

 M. Graves gives no measured sections in this latter department, but 

 he observes that the green sands forming the base of the Calcaire 

 grossier expand in a direction from east to west, from the neigh- 

 bourhood of Chambly to that of Gisors (Eure). M.Graves also 

 mentions that there thin seams of foliated grey and brownish clays, 

 with traces of lignites, are occasionally found subordinate to the 

 sands. The fossils of this division are of very irregular occurrence, 

 being absent or very scarce in most places, and abundant only in a 

 few, and then chiefly in its upper beds. j\I. D'Archiac considers that 

 none of the fossils are peculiar, but that those which most mark this 

 zone are the Turbinolia eUiptica, T. Gravesii; Lumdites radiata, and 

 the Pygorhynchus Grignonensis ; — species that are not found at 

 Bracklesham. As these beds range westward, however, they become 

 more fossiliferous, and in the department of the Oise M. Graves 

 gives several localities where a considerable number of fossils are not 

 only found in the Glauconie grossiere, but some of which have their 

 chief development in that bed. He names, amongst the most com- 

 mon, about seventy species from St. Felix, Ponchou, Parisifontaine, 

 Friancourt, Henonville, and Chaumont, of which number the folio tv- 

 ins 31 are found likewise at Bracklesham : — 



'O 



Beloptera belemnitoidea. Corbula striata. 



Cardiiim porulosum. 



Aneillaria buceinoides. semigraiuilosum. 



Buccinura stromboides. Crassatella compressa. 



Caly[)tr8ea trocbiformis. Cypricardia oblouga. 



Cassidaria carinata. carinata. 



Cerithium unisulcatum. Cytherea sulcatai'ia. 



Fusus bulbiformis. Ostrea flabellula. 



Natica epiglottina. Spondylus rarispina. 



■ patula. Tellina tenuistriata. 



Niso terebellata. V^enericardia aciiticosta. 



Ringicula ringens. planicosta. 



Scalaria acuta. 



Turritella imbricataria. Nummulites laevigatus. 



scaber. 



Anemia tenuistriata. Luuulites urceolatus. 



Chama calcarata. Tm'biiiolia sulcata. 



