528 J. F. .BLAKE ON" THE UPPER 



Pig. S.—Map of Part of the Valley of the Laignes. (Scale 1 : 80,000.) 



4 



The next traverse, though not along the valley of a river, is an 

 exceedingly instructive one, as we get an almost complete section 

 from the Corallian to the uppermost beds. This is across the hill 

 that intervenes between Gye-sur-Seine and the Eiceys in the south- 

 western portion of the department. Commencing at the former 

 place, we find a cliff cut at the road-side, and all the rocks laid bare. 

 At the base is (1) shelly limestone, similar to that at the top of the 

 Clairvaux section, with indications of bastard oolite, like the Di- 

 ceras-beds of Doulaincourt, and containing crinoid stems and Rhyn- 

 chonella pinguis. There is therefore still an absence here of the great 

 Diceras-masses ; and the type is conformable to that of the valley of 

 the Aube. Next (2) are from 30 to 40 feet of chalky limestones, split- 

 ting into rather thin layers, with Pholadomya cingulata, P. cor ?, and 

 AnisGcardia Legayi. Above this comes (3) a 2-foot band of a curious 

 blue earthy limestone, with globular masses of calc tuff. This seems 

 to be a bed of separation between two groups of rocks ; it contains 

 few fossils, except Pholadomyce (cf. P. ampla). If any definite 



