Mr. J. Lycett on the Upper Lias of Gloucestershire. 157 
estimate the general thickness of the Upper Lias at 100 feet 
to the fossils given in the former edition are added the follow- 
ing:—Ammonites falcifer, A. Strangwaysti, Belemnites Bru- 
guierianus, Trochus bisertus, Nucula rostralis, Atschna Brodiei, 
Astacus, Hippolita, Cidaris minuta. In the memoir by Mr. Hull, 
the Upper Lias is stated to be upwards of 230 feet thick at 
Leckhampton Hill; it is estimated to be 300 feet at Cleeve 
Cloud; in the hills further northwards, at from 80 to 100 feet ; 
it constantly declines in thickness towards the Oxfordshire 
boundary of the county, so that at Burford its thickness is only 
6 feet. In the southern portion of the Cotteswolds it is stated 
to be only 10 feet thick at Wootton-under-Edge, and about 
30 feet at Stroud; but I shall have to show that at Nailsworth, 
a spot situated between the two latter places, the thickness 
of the Upper Lias is upwards of 105 feet. The only additional 
fossils mentioned by Mr. Hull are Nautilus inornatus and Belem- 
nites abbreviatus. 
The sections upon which the present remarks are founded 
were made in forming several deep drains and a cutting for a 
earriage-drive upon a steep hill-side preparatory to building a 
villa and laying out the surrounding ground for ornamental 
purposes, upon the western side of the valley, and immediately 
adjoining the village of Nailsworth; it also happened about the 
same time that a cutting was made along the whole course of 
the turnpike road in the same valley, towards Stroud, for the 
purpose of laying down gas-pipes ; another small section was 
also afforded by some alterations made in the mill-stream at 
Holcomb Mills, about half a mile higher up the valley. The 
deep-drain sections afforded a view of the higher beds of the 
stage, even to their junction with the micaceous marly sands of 
the Cynocephala-stage ; the other cuttings exposed the lower 
beds, but less perfectly than the upper ones, and also some por- 
tion of the Marlstone series. But although a portion of nearly 
the whole of the beds was uncovered, the entire area from which 
fossils could be procured was very inconsiderable. In descend- 
img order occurred— 
Several feet of blue clay, with intercalated thin layers of dark- 
coloured shale. 
A thin stratum of grey, finely laminated shale, with clusters 
of valves of Posidonia Bronnii. 
Brown and blue clays and marly bands containing some irre- 
gular layers of hard shale, and of thin bands of blue argil- 
laceous limestone. 
Fossils were moderately abundant in the bands of limestone. 
02 
