LOWER LIAS : UPHILL. 91 
Here the junction with the White Lias is not so clearly defined 
as it is in the railway-cutting west of Shepton Mallet : but it is 
noteworthy that the Lias limestones present their ordinary 
characters, in proximity to the Mendip range. The Lower Lias 
limestones are well shown in places south-west of Wedmore, near 
Heath House, where the beds resemble those near Shapwick and 
Ashcot on the Polden Hills, and the lower beds at East Milton : 
they contain Ammonites planorbis and Ostrea liassica. 
The Lower Lias is exposed in the railway-cutting near Uphill, 
where it is faulted abruptly against the Carboniferous Limestone. 
The fault, which is a reversed one, was depicted in sections drawn 
by the Rev. D. Williams,* William Sanders, and others.t Beneath 
the Lias, the Rhaetic Beds and Keuper Marls are exposed, faulted 
in several places. The Lias presents its ordinary characters, as 
follows : 
Fr. IN. 
Zone of Ammonites ( Alternate beds of light-coloured limestone 
Bucklandi, &c. \ and shale, with Lima giyantea - - 10 
["Dark grey laminated shales and thin bands 
Zone of of limestone, with Ammonites planorbis 14 
A. planorbis. | Dark shales and bands of limestone with 
[_ Ostrea liassica - - - 7 4 
PVi ' T* rl / Alternations of limestone and marl, with 
I O. liassica, and Modiola minima - - 12 
It is noticeable here, that the White Lias becomes more marly 
in character, so that the limestones, as at Penarth, are subordinate ; 
moreover there is no great development of Lower Lias limestones, 
the beds belonging to the zone of Am. Bucklandi being represented, 
as on the Polden Hills, mainly by clay. 
West Somerset. 
The Blue Lias series is well exposed in the cliffs of West 
Somerset, between Sturt Point and Blue Anchor. The eastern 
part of this coast-line is far from accessible, and has not attracted 
much notice from geologists ; but all along, many instructive 
sections are to be seen, while the numerous faults and the effects 
of denudation form interesting subjects for study. (See Fig. 44.) 
Probably the earliest reference to the Lias in this area was 
made by Leonard Horner,J and long subsequently it was noticed 
* Trans. Geol. Soc., ser. 2, vol. vi. p. 562 ; Proc. Geol. Soc., vol. iv. p. 294; and 
Quart. Journ. Geol. Soc., vol. i. p. 48. 
| Geol. East Somerset, Plate III. p. 24; and H. B. Woodward, Geol. 
Mag. 1870, p. 239; Geol. Eng. and Wales, Ed. 2, p. 14; H. W. Bristow and R. 
Etheridge, Vertical Sections (Geol. Survey)* Sheet 46, No. 3 ; Wright. Quart. Journ. 
Geol. Soc. vol. xvi. p. 383, and Lias Ammonites ( Palseontogr. Soc.) p. 11 ; Moore, 
Quart. Journ. Geol. Soc., vol. xvi. p. 445 ; and W. J. Solhu, Proc. Geol. Assoc. 
vol. vi. p. 385. 
% Trans. Geol. Soc., vol. lii. p. 367. 
