958 Ww. A. E. USSHER ON THE TRIASSIC 
sand-rock is exposed; its junction with the marls of Le Cap is not 
shown, but it appears to rest upon them at Deville. 
To the north of Deville 14 feet of gravel are exposed in a pit; it 
consists of irregular quartzite pebbles, mostly small, exhibiting in 
places a rough indication of bedding, in the arrangement of the 
stones in lenticular seams with regard to gravity. In one part of 
the pit an irregular seam of grey sand is shown. The matrix of the 
gravel is a reddish-brown loam, earthy, and with fewer stones in 
the upper part. I cannot tell whether this gravel is of Triassic age 
or a redeposit of subjacent or preexistent Triassic gravels. In either 
case it seems to show that in this, as in other parts of the area, 
gravel formed part of the latest Triassic deposits. 
At Clist Williams Farm and the Blue Anchor Inn, north of Tal- 
laton, in Devon, gravels with argillaceous matrices rest on the lower 
marls (or Middle Trias). In general character the pit sections are 
very similar to that at Deville, and the same uncertainty prevails as 
to whether they are redeposited Trias or in situ. 
The following is M. Bonissent’s section * of the general succession 
of beds in the quarries of Montmartin-en-Graignes (the first seven 
beds are referred to the diluvium) :— 
1. Yellowish or whitish fine-grained sand, alternating with rolled stones of 
yarious sizes. 
2. Conglomerate with siliceous matrix. 
3. Reddish, greenish, or white-and-yellow mottled clays, with or without rolled 
stones. 
. Compact marls of various colours with occasional veins of yellowish-white 
sand. 
. Whitish micaceous sands. 
. Fragmentary Magnesian Limestone of various colours. 
. Sands and clays, 
~I OD St bs 
Below this, divesting the section of all minutiwe, the general 
succession would be :— 
8, Conglomerates, occasionally very caicareous in the upper parts. 
9. Grey calcareous sandstones. 
10. Light-coloured sandstones, partly calcareous, occasionally conglomeratic. 
11. Hard marls, red, or banded with other tints, containing in the lower part 
impure limestones. 
The thickness of the whole section is about from 77 to 80 metres 
(roughly 250 to 260 feet). 
Although cumbered with minute description, this section is very 
unsatisfactory in essential points. We are not told how much of the 
77 to 80 metres is taken up by the diluvial deposits ; and judging 
from their thickness on the south of Carentan, no more than 60 feet 
of Trias may be described. 
The relative thicknesses of the conglomerates, sandstones, and 
marls, particularly of the latter, have been unfortunately omitted. 
Department of Calvados.——Judging from Knipe’s geological map, 
the Trias does not extend more than five miles into Calvados from 
Littry—that is, for about fourteen miles eastward of the confines 
* Bonissent, op. cit. pp. 269-271. 
