i6 



THE EOCENE BEDS 



Classification of the Calcaire Grossier (after DoIIfus) 



o 



Oh 

 O S 



c/i 



;j 



o 



V. J3 5 ^ 



CI. ^:S^ 

 ^ ? k 



S 5 



lO 





Siliceoivs limestone and variegated marls. 



Limestone with Cardiitm obliqiiunt and Cerithiuni Blamvitlei. 



Siliceous limestone and marl. 



Limestone with Cerithiuni denticulatum and Potamides cristahts. 

 ■ \ Marl without fossils. 



Siliceous limestone with Potatnides. 



Siliceous limestone and marls alternating, without fossils. 

 I Limestone with corals {Styloccenid). 

 \ 

 ( 



I Siliceous limestone (5 ft.) with parting of laminated marl 

 I . (2 in.). 



-; Limestone in thin layers with Corbula (Rochette). 

 I Limestone with Miliola and Liicina saxoriim (Roche). 

 I Siliceous limestone with fossils (Bancs francs). 



;^ 





xn 



2 S 



^ 



-ICJ 



^§ ^ 



Limestone (dolomitic) (Clicquart) with Miliola. 



Green marl. j 



Siliceous limestone in two beds. ,- (Banc \"ert.) 



Green marl. ' 



Limestone with Miliola (dolomitic) (Saint-Nom). 



Siliceous limestone with Potamides ; accessory rocks. 



/Tabulated limestone with distinctive fossils. 

 I Limestone with Orbitolites and varied fossils. 





o 



J Limestone with Fnbiilaria and vegetable debris. 

 I Mass of limestone with Miliola, Turritella, and varied fossils. 

 (^Limestone with Miliola and Terebratula. 



^Glauconitic Calcaire Grossier with Cerithiuni giganteum (Banc 

 I a Verrains). 



Glauconitic sand, calcareous, with Lenita patellar is. 

 Glauconitic sandy Calcaire Grossier with Cardiiim porulosum 

 -\ (Pierre de Saint-Leu). 



Glauconitic sandy Calcaire Grossier with Nummiilites Icrvigatus. 

 Glauconitic sand, sometimes calcareous and indurated, with 

 pebbles of green quartz. 

 ^Sharks' teeth, rolled debris of corals, etc. 



Elsewhere* the same author has shown that the Calcaire 

 Grossier is divisible into two types. 



2. Fluvio-marine or Neptodunian. Type at Nanterre. 



, . . j Middle. Parnian. Type at Parnes. 



I. Marine. j L^^^gj.^ Calvimontian. Type at Chaumont. 



The more detailed classification is preferable for a complete 

 study of the formation. 



Our attention may now be directed to an investigation of the 

 characters of the many sub-divisions of the Calcaire Grossier ; and 

 we must point out that some of the component beds have received 

 distinctive names, mostly derived from the quarrymen's terms, and 

 therefore difficult or impossible to render in English. Our own 

 quarries furnish us with parallel instances, for example, the 

 " Bacon Tier," " Aish," and " Roach," of the Portland quarries. 



* DoUfus, Mem. de la Soc. Gcol. a". Ncrinandic. Havre (iSSo), pp. 591, 592. 



