LOWEK LIAS : hYMK REGIS. 
57 
The Lower Lias is exposed in the cliffs between Culverholc 
Point and Seatown, near Golden Cap. where the strata admit of 
the following divisions : 
ZONES. 
FT. 
' Green Ammonite Beds." 
Bluish-grey clays - 
Belemnite Beds." 
Pale irrey marls - 
Black Marl." 
Dark shales - 
Blue Lias " 
Limestones and shales - 
1 , 
105 J Ammonites capncornm and A. Henleyi. 
\(A. Ibex),* A. Jamesoni, and A. 
80 / armatus. 
. raricostatus, A. oxynotus, and A. 
obtusus. 
' sem ^ cos to,tus and A. Turneri, 
nngulatus, and 
^ 
1.95 f 
105 
485 
Bucklandi, 
planortns. 
A. 
A. 
1. " Blue Lias."" This division comprises alternating bands of 
limestone and clay or marl, to which, as elsewhere, the term 
"Blue Lias" is confined. 
The beds appear to the east of Culverhole Point, and probably 
extend higher up in the cliffs about as far west as Dowlands, but 
they are much tumbled and obscured by landslips. Proceeding 
eastwards, gentle undulations bring the strata to a higher level in 
Charton Bay, where the underlying White Lias and the beds 
down to the base of the Rhsetic series may be observed. 
It is not until Pinhay (or Pinney) Bay is reached that the beds 
a - c seen to advantage. A ravine and watercourse here coincide 
with a fault, that throws down the Lias limestones some 40 feet 
on the west (see Fig. 41), a dislocation depicted by De la 
Beche. On the east, the lowest beds of the Lias are seen 
resting on the White Lias, and in marked contrast as to 
colour. Now the upward succession can be traced, and each 
band of limestone can be examined. Before studying the beds 
in detail, it is however a good plan to obtain a general view of the 
cliff's from a boat at a short distance from the shore. In this way 
it will be seen that about 16 feet above the main mass of lime- 
stones, and separated from them by clays or shales, there is a 
conspicuous band of hard grey marl known as the Table Ledge. 
This band, increasing slightly in thickness, can be traced along 
these west cliffs as far as the Lime and Cement Works, beyond 
which the beds are concealed by the Esplanade ; but it re-appears 
in the Church Cliffs, descending to the beach at the foot of 
Black Ven, where its easterly dip carries it out of sight. (See 
Fig. 41.) This band is taken as the top of the Blue Lias series. 
Partly owing to the curvature of the coast, the beds in the West 
Cliff present a gentle synclinal followed by an anticlinal struc 
ture. Moreover below the Esplanade the beds sink again, so 
that the Cobb is based on the surface of the main mass of stone- 
beds, which appear on the foreshore, and here the ledges stand out 
in graceful curves that mark the synclinal structure. Some of 
the ledges that occurred here, as elsewhere, have been broken up 
* This specie? ha? not been recognized in this district. 
