THE EOCENE BEDS 



aj (u I- 



3 '<< ■« 



o 



o 





CJ 



Fig. 3. — General Section at Issy (Paris). 







Calcaire Grossier, very fossil- 

 iferous, with Volutilithes 

 cithara^ etc. (Grignon beds) . 6 6 



j Calcaire Grossier with many 



I fossils, Cerithiiun giganteum . 6 6 



j Glauconitic Calcaire Grossier with 

 ( fossils ..... 



Conglomeratic bed, Pain de prus- 

 sieii, with Nuuvnitlites Uvvi- 

 ,^(?//«andlargeg.ainsof quartz 3 3 

 J Impure clay, sand}' and pyritous, 

 / with lignite in parts . -33 



4 Grey sand with bands of lignite . 6 6 



i'Gre.y chiy^/aiisse glaise . 



• 5 o 



^^ £.^^ ~II ^ j:^ ? =.^? I Plastic clay, variegated, with 

 ^=- ~ - ^"^ ~=^=^ "( nodules of pisolitic iron 



j Marls with P/iysa, etc., found in 

 ( borings. 



From Dr. Hovelacque's Notes. 



7. LIGNITES OF THE SOISSONNAIS. 



About this horizon several local deposits are found which are 

 difficult to correlate with each other, but which generally are 

 lignitiferous or black clays of varying composition. According 

 to their development they have received numerous names ; but as 

 these have only'a local value, we prefer to describe the whole in 

 general terms. The lignitic characters are best marked in the 

 northern portion of the basin, and the beds are sometimes known 

 as the Lignites of the Soissonnais. Perhaps the best known 

 section is at Sarron, near Pont-St.-Maxence. At the time of our 



