ROCKS OF NORMANDY, 255 
Gorges, Gomfreville, Nay, St. Germain le Vicomte, Bohons, St. Eny, 
and Auxais. Pliocene marls occur at Marchesieux, Feugéres, and 
St. Martin d’Aubigny*. Dilvvium is developed at Raids and St. 
Sauveur (Le Vicomte) sur Douve’; it covers all the communes on 
the west bank of the river Elle, Beuzeyille les Veys, and Brevands ; 
and occurs at Dézert and St. Jean de Daiet. On the south and 
west of Carentan, the plateau cf Anvers, Méautis, the Bohons, and 
St. Eny is covered by diluvium which descends the slopes to the 
marshes (alluvium) of the river Taute. In this district it is said§ to 
be from 330 to 1640 feet thick (100 to 500 metres). 
As diluvium also occurs at St. Jores, Vindefontaine, Etienville, 
Picauville, Rauville-la-Place, and other localities, the evidence of 
Trias in this part of the area must be very meagre indeed. 
I will now proceed to quote all the facts mentioned in M. Bonis-~ 
sent’s work with reference to the occurrence of the Trias in this 
complicated area. 
Approaching l’Etang-Bertrand the Devonian is visible hera and 
there beneath the rolled stones of the Keuper ; from this hamlet it 
follows both banks of the river Douve, returning by the right bank 
towards the farm of Banoville, &c., after having previously traversed 
Rouge Bouillon and Loraille in Bricquebee and Négreville, but in 
this course it is often hidden under the Marnes irisées ||. 
The next notice] of Triassic deposits is at a considerable distance 
to the south of the above. Going from Périers to Pont Labbé 
reddish or lilac clays of the Trias, alternating with clays of a whitish 
or greyish hue, have been observed at St. Germain le Campagne 
(le Petit) south of Plessis. At Nay, on the road to Périers, and 
near a windmill and watermill, a reddish-brown quartziferous and 
calcareous rock, belonging to the Trias, covered by pebbles and red 
marls (redeposits of the same formation), was discovered under the 
Pliocene formation*™. 
Raids Church is on Diluvium ; but in following a small tributary 
of the river Séve for some distance from it Trias was met with, 
represented by sandstones alternating with shaly marls, both being 
mottled red and greenish. 
From these observations it would appear that the Trias of this 
part of the area is composed of the same general sediments as elso- 
where, but varying a little in character and mode of arrangement 
from local causes. 
District South of Carentan.—Near the church of St. Eny ty, in the 
ae of St. Georges de Bohon, and at the farm of La Joubar- 
diére tt, near Carentan, the diluvium does not appear to have been 
penetrated in wells sunk to a depth of nearly 33 feet; but in these 
localities $§ it descends from the hill-top to the marshes of the rivers 
Taute, Douve, Séve, and their tributaries. Nevertheless whitish 
and ereyish sandstones, sometimes calcareous, were noticed by 
M. Bonissent to the south of Carentan |||/, and considered by him to 
* Bonissent, op. cit. p. 323, &e. t Jb. p. 383. t J. p. 887. 
§ Jb. pp. 389, 390, || Zo. p. 248. q 2b. p. 260. #* Tp, p- 268. 
tt Jd. p.391. tt Jd. p.390, §§ Jd. p. 389, ||| 20. p. 269. 
