140 HIND : CARBONIFEROUS ROCKS OF ISLE OF MAN. 
I have been able to demonstrate this faunal sequence from 
the west coast of County Clare* to Clavier, near Dinant, in 
Belgium, t 
In co-authorship with Mr. J. A. HoweJ I proposed the 
name Pendleside series for these beds, the base of which is 
marked by the presence of Posidonomya Becheri, with a 
goniatite fauna, which later I have shown to be the homo- 
taxial equivalent of the Lower Culm of North Devon.§ 
Posidonomya Becheri Beds. 
The Posidonomya Becheri beds form the highest Carboni- 
ferous rocks in the south of the island, and they are well exposed 
at Poolvash in the old black marble quarry and on the foreshore 
below, and to a slight extent on the bank opposite the Stack of 
Scarlet (Plate XV). At the latter locality I obtained Phillipsia 
Polleni and Zaphrentid corals, and these beds must come on im- 
mediately above the top beds of Scarlet quarry. Some few feet 
of dark limestones with chert are found interbedded with the 
volcanic ash a little west of Close ny Chollagh. Here and there 
in the volcanic ash are seen fossils. I obtained Zaphrentid 
corals, Fistulijjora minor, M'Coy, Retzia ulotrix, and casts 
of Loxonema. On p. 253 of the memoir, Mr. Lamplugh quotes 
a specimen of Posidonomya Becheri in the Cumming collection 
as having an ashy matrix, and states that Mr. J. A. Howe ob- 
tained a specimen of Glyphioceras striatum in the ash beds. 
The species is nearly always associated with Posidonomya Becheri 
at the base of the Pendleside series in Yorkshire. It is there- 
fore very probable that the ash or part of it was of Lower Pendle- 
side age, and in connection with this it is interesting to note that 
the ash beds in the old quarry near Astbury, Cheshire, and in 
Tissington railway cutting, Derbyshire, occur at the same 
horizon, i.e., at the junction of the upper part of the 
Carboniferous Limestone with the Pendleside series. 
*Proc. Roy. Irish Acad., vol. xxv., sec. B, No. 4, pp. 93-116. 
t Rep. Brit. Ass., 1902. 
t Q. J. Geol. Soc, vol. Ivii., pp. 307-402. 
§ Geol. Mag. Dec. 5, vol. i., pp. 392-403. 
