18 STRATA EXPOSED IN CONSTRUCTING FILTON-AVONMOUTH RAILWAY. 
It may be now observed that most writers who have described in 
any detail sections of the Lower Rhsebic, note the presence of a hard 
shale with a paucity of fossils between the softer shale in which 
Avzcula contorta is most abundant and the horizon at which verte- 
brate remains are common ; or, applying another index fossil, below 
the range of Pecten valoniensis^ vide diagram II., page 17. 
The following is a summary of these observations extracted from 
the descriptions of L. Richardson, Prof. Reynolds and Dr. Vaughan, 
Dr. Rendle Short, and E. Wilson. 
1 Pylle Hill — Ft. 
Black shales, firm, generally unfossiliferous ... 1 
Black shale, with pockets of grit, containing 
bone-bed fossils, including Ceratodus ... 0 
Keuper 
2 Redland — 
Black shale, hard, not crumbly, very barren ... 1 
Bone-bed ... ... ... ... 0 
Green and black marl .. ... 0 
Ferruginous band ... ... ... 0 
Keuper 
3 Gotham — 
Black shale, hard, a few specimens of Avicula 
contorta and Axinus (no measurement) 
Keuper 
4 Charlton — 
Black shale, hard, very few fossils ... 2 
Bone-bed series ... ... ... 0 
Black shale, with band of calcareous breccia... 11 
Keuper ... ... ... 
5 Aust — 
Black shale, with arenaceous bands containing 
Pullastra, the upper part hard, very barren 4 
Bone bed, 1 — 6 ins. ... ... averaging 0 
Black shale ... ... ... 0 
Keuper 
6 Sedbury — 
Black shales, firm (no fossils recorded) ... 1 
Black shale, earthy ... ... ... 0 
Sandstones and shales, alternating ... 0 
Bone-bed ... ... ... ... 0 
Keuper 
Ins. 
r> 
5 
9 
2 
6 
1 
6 
7 
6 
0 
4 
10 
2 
6 
8 
4 
