70 Prof. E. J. Garwood—The Faunal Succession 
Ill. — Norres on tHe Faunat Succession IN THE CARBONIFEROUS 
Limestone oF WESTMORELAND AND NeEicuBourING Portions oF 
LANCASHIRE AND YORKSHIRE. 
By E. J. Garwoop, M.A., Sec. G.S., 
Professor of Geology in University College, London. 
N August last, at the meeting of the British Association at York, 
I gave a general account of the zonal succession of the Carboniferous 
Limestone as developed in Westmoreland and North Lancashire, and 
I instituted a comparison with beds of a similar age in the Ingleborough 
and North Pennine districts. 
In response to a request made at the meeting, I drew up a table 
in which a provisional correlation was attempted with the zones of the 
Avonian Succession. I had not then, however, had the opportunity 
of consulting Dr. Vaughan regarding his most recent conclusion, the 
correlation with the Avonian Succession being based on the tables 
accompanying his paper and that of Mr. Sibley on the Mendip area. 
I hope shortly to describe the Northern Succession more fully, but 
meanwhile I take the opportunity afforded by the courtesy of the 
Editor of the Grotocican Magazine to bring forward the problems 
involved in any correlation of the northern areas more fully than could 
be done in the short abstract published by the Association, and to 
revise the attempted correlation of the lower beds with Dr. Vaughan’s 
zones. 
The key to the northern area lies in the Iichelinea megastoma bed 
as developed in the Arnside section, where it contains a rich fauna. 
This bed, together with the underlying Meathop Limestones, I have 
long considered to lie near the base of the succession in the north, but 
its relation to the Shap and Ravenstonedale Limestones and the over- 
lying Ashfell Beds was not absolutely clear, on account of the absence 
of the Iichelinea bed from the eastern exposures. The lowest bed at 
Arnside contains amongst others the following characteristic forms :— 
Michelinea megastoma. Orthotetes crenistria. 
Zaphrentis atl, cornucopia. A thyris expansa. 
Caninia cylindrica, Chonetes cf. comoides. 
Productus aff. punctatus. 
In addition a very characteristic Cyathophyllum occurs in which the 
septa show a marked Zaphrentid type of grouping, and a new species 
of Chisiophyllum, which Dr. Vaughan has since told me he is about to 
describe from the basement bed at Horton, where it also occurs. 
Dr. Vaughan agrees with me that this fauna points to a position 
near the top of his C zone in the Bristol area. No Lithostrotions occur 
in the Chonetes bed, but immediately above, in the overlying Black 
Limestone of Blackstone Point, they occur in abundance, together 
with Diphyphyllum and Campophyllids, and I therefore take the 
Blackstone Point Beds as representing the base of §,. 
These beds can be traced for a mile or two in an easterly direction, 
and reappear again near the base of the Scout Scar section, both in the 
Brigsteer and Underbarrow road cuttings (Barrowfield Beds of the 
table). 
