OF THE PARIS BASIN. 



19 



lamellosum, Clavilithes JVooe, C. deforinis, Syaiin bulbiforine, 

 Ancilla Lamarcki^ Ancilla oiivula, Marginella crassuia and 

 Tei-ebelluin of several species may be instanced as examples of the 

 fauna of this rich horizon. 



The Foraminifera, especially such forms of Miliola as Bilocu- 

 lina, Triloculina and Quiiiqiieloculina, are exceedingly plentiful 

 and give the second name to this middle division — Calcaire 

 Grossier with Afiliola. The genera are, however, by no means 

 restricted to the Miliolina, Fabiilaria discolithes and Orbitolites 

 complanatus being especially abundant, very large and well pre- 

 served, at the localities already mentioned. 



Upper Calcaire Grossier (including the " Caillasses "). The 

 upper division of the Calcaire Grossier is composed, as we have 

 already seen of beds of very varied mineralogical characters, with 

 thin-bedded limestones, in part siliceous or dolomitic. 



The beds which have received distinctive names are for the 

 sake of clearness repeated here ; of these named beds the Marls 

 of Nanterre is the uppermost. 



Divisions of the Upper Calcaire Grossier. 



r 



I Caillasses, of man}- 

 ( authors. 



Caillasses or Upper | 



Calcaire Grossier \ 



of G. Dollfus. I 



"1 



J 



Upper Calcaire 

 ! Grossier with 

 I Cerithium, of many 



authors. 



Marls of Nanterre. 



Rochette. 



Roche (de Paris). 



Bancs francs (de Paris).. 

 fClicquart. 

 I \ Banc Vert. 

 1^ l^Banc Saint-Nom. 



The beds above the Marls of Nanterre will be described in 

 due course. 



The '■'■Banc Vert" offers one of the most constant horizons in 

 the Paris basin, and the following section after Stanislas Meunier 

 clearly shows the general character of this level. 



Fk;. 5. — Section of the " Ba?ic Vert." 



T 



6. Clicquart. 



5. Bed with Dissosloma mitmmin. 

 ') 4. Bed with Potamides lapidiiin. 



3. Bed with Ceyithiitm miitabile. 

 2. Lignite. 

 ^~F"Tl]t(^ I. Saint-Xom. 



