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VOL. XIV. (2) RH#TIC ROCKS 133 
base is occasionally present a thin arenaceous layer. 
They are very pyritic, especially about 3-5 inches below 
the Bone-bed, which is the superincumbent stratum. This 
Bone-bed is apparently contemporaneous with an analog- 
ous stratum at Coomb Hill, Garden and Aust Cliffs, and 
other well-known localities. Normally it is a very hard, 
" grey, calcareous and pyritic sandstone, with numerous verte- 
brate remains, chiefly of fish; but in places, even in the 
Wainlode Cliff section, it passes into a yellow, micaceous 
and non-calcareous sandstone devoid of such remains. At 
that end of the cliff furthest from the Red Lion Hotel, the 
Bone-bed is composed of several layers separated by a 
clay parting from the lowest layer which is the most 
ossiferous. The Bone-bed-equivalent is well exposed 
towards the middle of the section, where it weathers into 
three main layers, the median one, often of a greenish 
tint, occasionally yielding fragments of ichthyodorulites. 
This Bone-bed-equivalent is still more developed to the 
north-east; for in the left bank of the road descending to 
the Red Lion Hotel, it is about a foot thick, and of a dark 
brown colour. When devoid of vertebrate remains this 
sandstone is found to contain in some numbers Strickland’s 
“ Pullastra arenicola,’ which is probably a species of 
Schizodus.. In some of the sandstone casts, the lines of 
growth near the ventral margin are well defined. This 
“ Pullastra” is not, as stated by Strickland, the only shell 
found in the sandstone,” for in most of the sections 
recorded in this paper I have found obscure casts of a 
broad form of Wodztola minima? ; and Avicula contorta 
is not uncommon. 
The vertebrate remains are often numerous individually, 
if not specifically ; the scales of Gyrolepis Alberti and the 
1 Strickland describes this species as follows ;—“‘Its form is nearly a perfect oval, 
depressed, nearly smooth, but with faint concentric striations towards the margin. The 
apex is about half-way between the middle of the shell and the anterior end. The general 
outline closely resembles that of the recent Pz//astra aurea of Britain. Maximum length 
7 lines, breath 4% lines, but the ordinary size is less.” Proc. Geol. Soc., Vol. iv. (1846), 
footnote pp. 17, 18 ; Memoirs, p. 168. 2 Memoirs, p. 168. 
