8° Salter—-Budleigh Salterton Pebble-Bed. 
the Brachiopod and other Bivalve Shells are not the same ; 
and, in order to identify them as belonging to one and the 
same period, we are compelled to the belief, strengthened as it 
is by many considerations, that a land-barrier of some extent, 
indented by bays and inlets, ran across in an east. and west 
direction, separating what is now-Wales from what 1s now the 
peninsula of the Cotentin and the promontory of Brest.* One 
or more of these inlets ran deep into the Cornish region, and 
another, doubtless, ranged up to the Exeter district. For we - 
UPPER SILURIAN. HARTLAND 
(BRITISH AREA.) POINT 
BUDLEIGH SALTERTON |x 
SPART POENT. 
LOWER SILURIAN. 
(FRENCH AREA.) 
LIZARD POINT. 
Fig. 1. Sketch-map of the Cornish and South-Devon region during the ‘ Lower Silurian’ times. 
find that the pebbles of Budleigh Salterton, now arranged in 
the New Red Sandstone, and originally derived from Silurian 
rocks, which could not be far off, contain French and not 
British species; not a shade of difference can be detected be- 
tween the Silurian fossils from May and Jurques, near Caen 
(and some from Rennes), and those from the Devonshire beach. 
There is yet more perfect evidence of this, which, as it has 
* I do not know that the Welsh marine area extended so far south as in this 
sketch. Mr. Godwin-Austen draws the barrier along the line of the Bristol 
Channel (Quart. Journ. Geol. Soc., vol. xii. pl. 1); but the Llandeilo and Caradoc 
rocks of South Wales were certainly accumulated in tolerably deep water (the 
Caradoe especially so); so that the north shore of the barrier was probably further 
to the south than his sketch would lead us to suppose. The correction is com- 
paratively trifling ; the main point is the existence of this barrier-line of old land 
separating the northern from the southern sea. 
