25 
pal^oxtological notes ox the millstone grit beds between 
masham and great whernside. 
by wheelton hind, m.d., b.s., f.r.c.s., f.g.s. 
(Read Nov. 20th, 1913). 
From time to time some Millstone Grit Fossils have been noted 
from the district round Harrogate and Pateley Bridge, the list given 
in the Memoir of the Geological Survey, " The Geology of the Country 
north and east of Harrogate," by Fox-8trangways, page 7, being 
the most recent and up-to-date. 
I was fortunately able to make a fairly extensive collection from 
these localities at the time of the visit of the Yorkshire Geologists' 
Association to Pateley Bridge in 1906, and have been waiting since 
then for an opportunity to pursue the subject. Fortunately Mr. 
Bisat took up the question of fossil horizons in the Millstone Grits, and 
has kindly allowed me to examine all his material and now to co- 
laborate with him. 
Several new species of lamellibranchs have occurred in the Cayton 
Gill Beds which I now propose to describe, but perhaps the most 
interesting fact is the facies of the fauna, which contains a large number 
of species common to it and the Dibunophyllum beds of the Carbon- 
iferous Limestone, and does not contain the Goniatite fauna and its 
associated lamellibranchs so frequently met with in the slate beds 
between the different members of the Millstone Grit, for example at 
Wadsworth, Eccup and Sabden. 
Messrs. Barnes and Holroyd described a fossiliferous bed of Mill- 
stone Grit on Pule Hill (Trans. Manch. Geol. Soc, Pt. vii.. Vol. xxv.), 
but the i' iems to be almost entirely different from the one under 
descrip o brachiopoda were found there. 
The ence in the Cayton Gill Beds of so many species of fish, 
brachiopods, nmellibranchs and cephalopoda which were last seen 
in the Dibunophyllum zone opens up the whole question of strati- 
graphy. Do the grits of the Pateley Bridge area represent a horizon 
totally different from those further south ? Is the horizon of this 
fauna accurately known with regard to the occurrence of the same 
fauna elsewhere ? Why is not the real Millstone Grit fauna met with * 
in the series except at Colsterdale, and there only in part ? 
The Colsterdale fauna is almost totally different from that of the 
