Vol. 52.] A DELIMITATION OF THE CENOMANIANV 127 



Blangy lies in a branch of the main Touques Yalley. On the 

 southern side of this valley, along the high road leading to the 

 village, the outcrop of the Upper Greensand was evident in many 

 places, hut no good section was seen. 



On the northern side of the valley the hills are more precipitous, 

 and there occur several small pits in the basal part of the Ceno- 

 manian. In one of these yellowish-white glauconitic chalk was 

 seen passing down into yellowish-grey marly chalk containing much 

 glauconite, and in a small exposure 30 yards to the west this was 

 seen to be underlain by grey calcareous marl containing much 

 glauconite in large grains. Farther on, several small exposures in 

 the bank showed this calcareous marl passing down into a green- 

 sand. There was no complete section, and no hard lumps were 

 found, but it was evident that the Cenomanian passed down through 

 a bed of marly glauconitic chalk to the greensand. Returning to 

 the main road, the grey marl and glauconitic junction-bed were again 

 seen in a ditch about 3 miles north of Lisieux. 



At the village of Hermival, which lies in another minor branch of 

 the Touques Valley, the Upper Greensand was well seen, by following 

 a newly-cleared ditch by the side of the roadway, passing up into a 

 grey glauconitic marl, at the top of which was a bed of hard 

 crystalline lumps between 1 and 2 feet thick ; this was overlain 

 abruptly by yellowish-grey glauconitic chalk. A small spring 

 seemed to issue from the junction of the two beds. 



About 1J mile south of Lisieux, just before coming to the 

 village of St. Martin de Liette, is an interesting exposure in a large 

 sandpit, which shows that the Carstone-like bed at the base of the 

 Gault, to which we have drawn attention in the section of the cliffs 

 of La Heve, persists thus far, though somewhat attenuated. The 

 section is as follows : — 



Feet. Ins. 



Rubble of grey chert and sandy soil 2 



Very glauconitic and rather marly sand 2 6 



Dark grey, greasy clay 9 



Coarse brown pebbly grit, with much fossil wood 



and many light-coloured phosphates 7 



White micaceous sand about 40 



The white micaceous sand is part of the ' Sables de Glos' (Corallian). 

 On this rests the coarse brown grit, which is succeeded abruptly 

 by the clay. We found no fossils in either, except the cast of 

 a Natica in the brown grit, about 18 inches from the top ; but 

 M. Bigot, of Caen, informed us that he had found others in the 

 same bed, and kindly sent them to us for inspection. Most of 

 them showed a matrix of very glauconitic material, and we think 

 that they have come from the very top of the grit (or Carstone) at its 

 junction with the clay. Among them we could identify Ammonites 

 interruptus (vars. Deluci and dentatus), Pecten orbicularis, Cucullcea 

 fibrosa ?, and a large Cyprina or Cucullcea. There was also a 

 Natica in a brown matrix, like that of our own specimen. The 



