pper Cutting. Lower Cutting. 
THE AVONIAN OF THE AVON GORGE 
103 
ocaldetail: 
N.B. — The beds are dealt with in ascending order and the 
Plate 11. particular cutting which has yielded the best results is indicated 
at the side. 
/(a) In the lowest 15 feet of the sequence, near the wall, 
thin slabs can be seen whose surface is covered 
with Spirorhis (.?), small Gasteropoda and Ostracods 
and with an occasional specimen of Modiola. 
(b) The next 30 feet is very poor in fossils, but a thick 
bed, near the top, contains the small Eumetroid 
Rhynchonellid in some abundance. Resting upon 
this bed is a thick band of shale. 
(c) The upper part of this shale-band, and the limestones 
and shales above (some 20 feet in thickness) are highly 
fossiliferous ; all the shales yield abundant Ostra- 
cods and Modioliform Lamellibranchs (Modiola lata 
being extremely common), while the weathered 
surfaces of the limestones are covered with Bryozoa 
and with fragments of Brachiopods and'Crinoids. 
The lowest hard bed in this series is a black compact 
somewhat nodular limestone, rich in Leperditia 
K (one of the largest forms in the Ostracod group). 
^ At the base of this series, Athyris Roysii is extremely 
abundant in the upper cutting. (This is a striking 
instance of the patchy distribution of individual 
forms). A large number of specimens of the shell 
should be collected, especially from the shales ; 
when cleaned, the fringed expansions are often 
beautifully shown. 
A little above Athyris Royssii level, hunt should 
be made for a remarkable branching Bryozoan 
(Rhomhopora F) which, at first glance, resembles 
Lithostrotion junceum. 
(d) The thick calcareous grit will scarcely repay examina- 
tion. 
