JTRASSIC OF THE PARIS BASIN. 



537 



in Cotteau's exhaustive list is Amm. achilles ; of the other fossils, 

 Trigonia clavellata, Ctromya excentrica, Unicardium globosum, 

 Phasianella striata, and Cidaris florigemma are the most noteworthy. 

 These beds are believed by MM. Rover and Tombeek to correspond 

 to the marly beds overlying the Diceras-beds of the Haute-Mame ; 

 but by their position they must be part of the lithographic 

 limestones which underlie those beds, though overlying the basal 

 Coral Rag. 



The true position of these rocks is further certified by continuing 

 the examination downwards. On the north side of the Tonne, at 

 Coulanges, are seen, below the beds already described. 12 feet or 

 more of uniform compact limestones with Gryphcea dilatata, and 

 then some sandy limestones, like those of Pacy, but more false- 

 bedded and irregular, with abundance of Terebratula bisuffcir r 

 cinata, also Trigonia spinifera, Xerincea allien, and many corals 

 here and there. These, which are doubtless the same as the 

 siliceous limestone of Druies, correspond very well with what we 

 might expect, though under a form slightly different. It is at some 

 distance below these that the fossiliferous zone of Amm. transver- 

 sarius occurs on the road to Clamecy. 



6. Department of Nievre. — The only description of the Upper 

 Jurassic rocks of this department is by Ebray (32), supplemented 

 by some notes in the paper by AIM. Douville and Jourdy (60). The 

 series is thus described by Ebray : — 



KlMMERIDGIAN. 



Astartian Limestone. 



Corallian. 



Upper Lithographic Limestone. 



Oolite with small Diceras. 



Chalky Limestone. 



Lithographic Limestone. 



Oolite of La Charite with Diceras arietinum. 



Marly Limestone. and Lower Lithographic Limestone. 



Abgovia>\ 

 Sponge-marls with Amm. canaliculatus. 



The only traverse made in this district is along the valley of the 

 Loire, from La Charite to the north of Pouilly. At the former 

 place large masses of very marly limestone, having a markedly Ox- 

 fordian aspect, are worked, in which fossils are very rare, but from 

 which Amm. bimammeitus and Amm. canaliculatus have been recorded. 

 These continue some distance ; but halfway to Meves are large 

 quarries showing a -±0-feet face of white limestone, with much of the 

 rolled pisolitic material characteristic of Diceras-beds : and that genus 

 here abounds, associated with. Nerincea. Had one never seen the 

 limestone of Coulanges, one would, doubtless, take this for the 

 ordinaryDiceras-bed, and its low position would be a difficulty ; but 



