STRATA EXPOSED IN CONSTRUCTING FILTON-AVONMOUTH RAILWAY. 19 
7 Garden Cliff — Ft. Ins. 
Black shale, firru, not very fossiliferous ... 1 0 
Black shale with sandstone layers ... 0 7 
Bone-bed ... ... ... ... 0 1 
Black shales with sandstones ... ... 6 5 
Keuper 
8 SODBURY — 
Black shale, non-fissile, with a rare tooth or 
vertebra (no measurement) 
Bone-bed ... ... ... ... 0 3 
Palajozoic rocks 
9 Stoke Gifford — 
Black shale, hard, very barren ... ... 2 0 
Keuper 
10 Goldcliff — 
Black shale, firm (no fossils recorded) ... 2 0 
Grit, shale, and sandstones, with bones, teeth, 
and scales ... ... ... 1 0 
Keuper 
1 1 Lavernock — 
Black shale, tough (no fossils recorded) ... 1 1 
Various thin sandstones, limestones, and shales, 
with fish remains ... ... ... 2 9 
Bone-bed ... ... ... ... 0 1 
Shales, marls, and limestones, including the 
“Sully Beds” ... ... ... 16 0 
It will be noted in looking through the preceding list that at 
Cotham and at Stoke Gifford no bone bed was found : the hard 
shale at those places resting directly upon the Keuper marl. Probably 
the explanation of these exceptions is, that the Keuper marls at those 
places were not submerged when the bone bed deposits were laid 
down, but that they were submerged sufficiently soon afterwards to 
receive the sediment which formed the hard shale. 
It would appear that wherever in these areas the Lower Rhsetic 
is sufficiently complete, a deposit of bone bed, or some deposit of 
equivalent character, is found. This deposit is succeeded by a series 
containing a distinctive barren shale, which occupies a definite position 
in relation to Fecten valoniensis and Avicula contorta^ viz., below 
the first appearance of the one and the maximum development of 
the other. 
This similarity of general sequence, lithological and palfcontologi- 
cal, over so large an area seems to support the view that the deposits 
in question are stratigraphical equivalents one of another, notwith- 
standing their varying position in relation to the apparent base of 
the Rhsetic series. 
