LOWER WENLOCK GROUP. 
91 
LowER WENLOCK Rocks (Woolhope Limestone and Shale; Denbigh Grit and Flagstones ; 
Coniston Flags (upper) and Coniston Grits). 
The base of the Wenlock series is in Shropshire and the border counties represented by a limestone (the 
Woolhope), which differs a good deal in its organic contents from the Wenlock limestone. 
In N. Wales the Denbighshire grits occupy this place, and contain Wenlock fossils. 
into the lower portions of the Denbigh flagstones. 
They pass eastward 
In Westmorland the Coniston or Brathay flag (upper part) has several of the fossils of the Denbigh flagstone. 
Both in it, and especially over it, lie thick beds of grit, the chief mass of which (Coniston grits) has fossils like 
those of the Denbigh flagstone and Coniston flagstone. 
We therefore class all these together as Lower Wenlock. 
But as it is not quite certain how far the two formations (Denbigh grit and Denbigh flagstone, and Coniston 
grit and flagstone) are to be considered identical, I give the lists side by side, not mixed together. 
Lastly, there is good reason to believe the flagstones of Balmae, Kircudbright, are of this age. They con- 
tain Wenlock fossils, with some Graptolites and others, which render this the more likely position for them. 
Denbighshire grit D. G.; 
Denbighshire flagstone D. F. 
Coniston grit C. G.; Coniston flagstone C. F. 
Woolhope limestone and shale W. L. 
Kircudbright flagstones (Balmae shore) are certainly the equivalent of the Denbigh flags (J. W. Salter). 

raed Reference to McCoy’s’ - 
Drawers. |Synopsis: and Figures of Genera. 
Names and References; Observations, &c. 
Numbers and Localities. 

G. ludensis, p. 4. 
CX 2», 
FL sdi sabia 
= =as> 
G. sagittarius, p. 5. 


HYDROZOA or BRYOZOA. 
Graptolites priodon, Bronn (Siluria, 
2nd ed. pl. 12, figs. 1, 2). 
Graptolites Flemingii, Salter (Quart. 
Journ. Geol. Soc. vill. p. 390). 
Differs in the broader shaft, and 
narrower straight teeth (cells) 
from the common G. priodon. 
It is probably a very common 
species in Lower Wenlock. 
(G@. sagittarius is a Lower Bala 
species.) 
Wales and Shropshire. 

D. G. Moel Seisiog ; 
b. 548, Gwyddel- 
wern, Llanrwst. 
D.F. b. 549, Pen- 
y-Craig, Llangynyw ; 
b.550, Llansantfraid, 
Glyn Ceiriog (as Di- 
plograpsus pristis) ; 
D.G. b. 551, Nant- 
Gwrhwyd Uchaf ; 
under Bron Einion. 
b. 554, D. F. Craig 
ddu Allt, Llangollen. 

Westmorland and 8S. of 
Scotland. 
C.G. Casterton Fell, 
N. end. 
C.F. Common at 
Helmside, &c. ; b.555, 
Helms Knot; b. 556, 
Brathay; a. 244, Re- 
becca Hill, near UI- 
verston ; Outrake, 
near Ulverston; a. 
244* D. F. Balmae 
shore, Kireudbright. 
a. 245* D. EF. Bal- 
mae shore, Kircud- 
bright. 

12—2 
