82 VAUGHAN : A NOTE ON CARBONIFEROUS SEQUENCE. 
part, contemporaneous, though each was undoubtedly the 
expression of a distinct bathymetric level. At the same time, 
the evidence points strongly to the conclusion that the P. Becheri 
Beds are, in the main, later than, and successive to, the Cya- 
thaxonia Beds. 
In my opinion, Dr. Hind has rendered an immense service 
to Carboniferous stratigraphy in insisting upon the distinctness 
of the Pendleside fauna, and he has fully appreciated the earliest 
possible level at which it is imperative to forsake the corals 
and Brachiopods and to rely upon Lamellibranchs and Goniatites. 
III. — The ' Millstone Grit ' of Pateley Bridge. 
Assuming that the base of the ' Millstone Grit ' is con- 
formable to the Angram Shales, it follows that the introduction 
of ' Grit ' conditions took place in early Pendleside time and 
that the lower part of the ' Millstone Grit,' in the Pateley 
Bridge' area, corresponds to the Pendleside Shales of N. Stafford. 
This conclusion places the date of the introduction of the ' Mill- 
stone Grit ' period in the Pateley Bridge area appreciably 
later than in the Bristol area, where is very abbreviated, 
and the ' Millstone Grit ' succeeded limestone almost im- 
mediatel3^ 
With the fauna of the ' Millstone Grit ' I have little 
concern, except the interest which attaches to the Brachiopods 
which survived from Avonian times. 
In some fossiliferous beds, which we visited in the ' Millstone 
Grit ' of the immediate neighbourhood of Pateley Bridge, the 
following Brachiopods occurred in considerable abundance : — 
Orthotetes sp. 
Derby a sp. no v. 
Schizophoria resupinata. 
Productus concinnus (spinose mutation). 
P. corrugatua. 
Chonetes sp. 
Spirijerina cf. cristata. 
The Derhya is remarkable for its size and for the striking 
development of the mesial septum of the pedicle valve. 
