128 
LIAS OP ENGLAND AND WALES : 
found elsewhere abundantly in the Marlstone ; Gryphcea cymbium 
is also a Middle Lias form. 
Rolled pieces of Carboniferous Limestone, and occasionally 
pebbles of quartz, occur in the beds, but they are more remarkable 
for phosphatic nodules and phosphatized fossils, which occur at 
different horizons, though not in great abundance. These facts 
furnish evidence of reconstruction and of pauses in the deposi- 
tion of the strata. Bristow and myself noticed a limestone, the 
base of which contained many black irregular and tough calcareous 
nodules in several of the quarries near Timsbury, Paulton, and 
Radstock.* At Timsbury this bed occurred 3 ft. 9 in. above 
the Sun bed, and we obtained Gryphcea arcuata in a bed of 
clay immediately above it. Ammonites planicosta occurs at this 
locality. 
The following section at Branch Huish, south-east of Radstock, 
was noted by E. B. Tawneyf : 
Upper Lias P Yellowish-brown clays ... 
ivf -JAI T / Pale-grey iron-shot limestone, with Cardinia 
lel4M.| condnna, Myacites, &c. - 
Light yellow iron-shot limestones, with Am- 
monites Jamesoni, A. Ibex, A. brevispina, 
Nautilus, Gryphcea cymbium, Inoceramusven- 
tricosus, Terebratula punctata, Waldheimia 
numismalis, Rhynchonella tetrahedra, &c. - 
Lower Lias. < 
Pale marly limestone, with dark phosphatic 
concretions, Ammonites raricostatus phos- 
phatized 
f Pale limestones with clny-partings, Ammonites 
[_ planorbis, Lima gigantea, &c. (Corn grit) - 
Rhaetic Beds. White Lias. 
FT. IN. 
2 6 
1 6 
6 
1 5 
4 
Tawney grouped the beds above the " Corn grit," in this 
section, with the Middle Lias, in accordance with the classification 
employed by Dr. Wright; but the fossiliferous beds belong chiefly 
to the Lower Lias, according to the grouping now adopted. 
West of Radstock Church, in the Wells road, the Lower Lias 
limestones are much more thickly developed ; and the following 
section was described by Tawney, t with whose notes my own are 
incorporated : 
FT. IN. 
"Grey clay with phosphatic nodules, Spi-~] 
riferina Walcotti, Rhynchonella varia- | 
bills, Grypliaa arcuata, &c. - - J> 7 
Two thick beds of limestone, separated | 
by grey shaly clay, with G. arcuata -J 
About 30 layers of grey and brown argil- 
laceous limestone, with thin clay-part- 
ings, G. arcuata, Lima yiyantea, L. 
punctata - 
Thin even beds of fissile sandy limestone 
and shale (4 or 5 layers), Ostrea lias- 
sica, Modiola minima (Corn grit) 
Lower 
Lias. 
Zones of 
Ammonites 
Bucklandi 
and 
A. planorbis. 
18 
Rhastic Beds. White Lias. 
3 
* These are also noticed by Lonsdale, Trans. Geol. Soc., ser. 2 , vol. iii. p. 246. 
t Proc. Bristol Nat. Soc., ser. 2, vol. i. p. 186. 
J Proc. Bristol tfat. Soc., ser. 2, vol. i. p. 170. See also E. Tate, Quart. Journ. 
Geol. Soc., vol. xxxi. p. 495. 
