THE LOWER LIAS OF KEYNSHAM. 
7 
of the larger faults is to be seen in the disused quarry marked 
2 on the map, where the Lower Lias has been thrown down 
to the south so as to rest against the Keuper marls. 
A very good instance of a smaller fault is to be seen in 
exposure 3, where the Arietes beds are thrown down to the 
north and rest against Angulatus beds on the south. 
The horizontal section illustrates all the most important 
geological features alluded to above ; it shows the relation 
of the Lower Lias to the rocks above and below, the exposure 
of lower beds by the denudation of the Avon and its tribu- 
taries, and the displacement caused by one of the larger 
faults. 
One of the matters of chief interest in the Lower Lias of 
Keynsham is the transition which it exhibits between the 
peculiarly attenuated development of that series in the Rad- 
stock area and its more normal development further north. 
The Keynsham district has not attracted nearly the same 
amount of attention as has the neighbouring area of Radstock, 
which forms its southern continuation. The only detailed 
accounts of the Keynsham area are to be found in a paper bj^ 
Moore 1 and in the Survey Memoir.^ 
To no single individual, as to Charles Moore, do we owe so 
much for a knowledge of the geology around Bristol ; with 
indefatigable energy he extended his researches far and near 
and yet worked out each section in the most patient detail. 
By laborious collecting and careful horizoning, he paved the 
way for the very detailed zoning which is the prominent 
feature of all recent work. 
In so far as his paper deals with the Keynsham district it 
had two main objects, firstly, to establish a general com- 
parison with the neighbouring Lias areas of Somerset and 
South Wales, and secondly, to describe in detail many new 
^ Log, cit. 
2 Jurassic HocJcs, vol. iii. 
