~I 
28 PROF. REYNOLDS AND MR. VAUGHAN ON THE | Noy. 1902, 
Stoke Gifford, but close to its southern border, the White Lias 
includes, between the Sun-Bed and the Cotham Marble, a small 
number of thin limestone-beds precisely similar in character to the 
beds of the thick White-Lias series seen in the neighhourhood 
of Bath and Radstock. 
The Ostrea-Beds. 
These include about 4 feet of thin limestone-beds, separated by 
subsidiary shales. 
Pleuromya Crowcombera, Ostrea liassica, Modiola minima, Phola- 
domya glabra, and Lima punctata occur abundantly. ‘he character 
of the various beds and the vertical distribution of these fossils in them 
is almost identically the same as at New Clifton and Kelston. 
The Planorbis-Beds. 
These consist of two or three thin limestone-beds, capped by a red 
ferruginous clay. Ammonites planorbis is very common, especially 
in the uppermost limestone-layer which is thin, extremely irregular, 
and much iron-stained. ‘The spines of small echinids can be seen, 
weathered out on the surfaces of the limestones. 
The Torus-Beds 
(including part of the Lima-Beds). 
These form the top of the section, and only a thickness of about 
2 feet is shown. They consist of a lower series of white rubbly 
limestones, in which Ammonites torus is very common; a middle 
thick clay ; and an upper series of hard hmestones, in which large 
specimens of Lima gigantea abound. 
The following is a complete lst of the fossils found in the 
Lower Lias of the Stoke-Gifford cutting, assigned to their respective 
horizons :— 
( Ammonites Johnstoni, Sow. = 
| Amin. (Psiloceras) torus, 
aA = a Oe Hard limestones. d’Orb. 
Lort Fate May * Clay. 4 Lima gigantea, Sow. 
oi Rubbly white limestones. L. hettangiensis, Terq. 
Rhynchonella  calcicosta, 
| Quenst. 
| ( Ammonites (Psiloceras) 
, Red clay. !  »lanorbis, Sow. 
PLANORBIS-BEDs. : 4 an gigantea, Sane 
Thin limestones. | L. punctata, Sow. 
\ Pseudodiadema (¢) 
Ostrea liassica, Strickl. 
Lima valoniensis, Dum. 
’ 
i 
imestone-beds, with sub- | : oe 
Lime : ; 4 Modiola minima, Sow. 
| 
( 
| 
| 
4 
| 
menos : 
| 
( 
{ 
OsTREA-BEDS. ! 
i 
@ 
4 feet. Petras side ! Bees Crowcombeia, 
| Pholadomya glabra, Ag. 
Sun-Bep. 
7 inches. 
Cotnam MARBLE. 
