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tute: the cayton gill beds. 
trict very greatly disturbed by faults, which are concealed by pasture 
and arable land. It would be an advantage, therefore, I think, if 
they could be distinctly marked by some special colour in the Geolo- 
gical maps of the district, and not concealed under the general colour 
for sandstone. The fossils generally occur as casts, sometimes filled 
with carbonate of iron, and often highly interesting, as they preserve 
the muscular impressions, &c., with great delicacy. In the land near 
Fountains, where the rock is exceedingly hard, the shell structure of 
brachiopoda is beautifully preserved, but the shells of Bellerophon 
costatus have become porcellanous. Here, as in some other places, 
the beds are filled with the broken stems of encrinites. 
The fossils which I have noticed are as follows : — 
Scales of Acrolepis. 
Teeth of Cladodus. 
Teeth of Petalodus. 
Portion of Encrinite Stems. 
Producta semireticulata. 
„ cora. 
„ aculeata. 
Spirifera trigonalis. 
„ striata, 
lineata. 
Streptorhynchus crenistria. 
Orthis resupinata. 
„ Michelini. 
Chonetes Hardrensis. 
Discina. 
Aviculopecten. 
Bellerophon costatus. 
Discites sulcatus. 
Nautilus. (Found at Hungate Gill, by Mr. Ingleby.) 
Gasteropods. 
Conchifers. 
Outcrops of these beds occur in the following places : — 
1. In the Parish of Bishop Thornton. 
