Reports & Proceedings—Geologists’ Association. 98 
and ferrous carbonate. Buried within the ash filling the vent are 
ereat masses of a rock composed of a sandy, dolomitic clay, of a nature 
not occurring on the shore in the immediate neighbourhood, and 
evidently belonging to a higher horizon. It is manifest also that the 
clifis themselves have been breached by the vent, and a large, 
nearly semicircular recess has thus been produced. In the ash 
of the vent numerous blocks and bombs of trachyte were found. 
(6) The remains of a bed of very coarse conglomerate which lies 
unconformably across the outcrop of shales at low-water mark. 
This bed is apparently of very modern origin, and points to a time 
when the land was somewhat higher, and probably covered with 
sand dunes having many pebbles and rocky fragments at their base. 
These have been cemented in a sandy matrix, all bound together 
by carbonate of lime derived from the water which has filtered down 
through the sand dunes. (7) A peculiar structure in the rocks on the 
shore; it is of some size, and is bounded by a semicircular fault 
with a hade inwards of 30 to 45 degrees. It resembles a ring fracture 
of the strata caused by the sudden subsidence of a limited area. 
2. “An Exhibit of Maps and Memoirs of Anglesea, by Edward 
Greenly, F.G.S.” By the President. 
GEOLOGISTS’ ASSOCIATION. 
Friday, January 7, 1921. 
* The Post-Pliocene Non-marine Mollusca of the East of England.” 
By A.S. Kennard, F.G.S., and B. B. Woodward, F.L.S., F.G.S. 
This paper deals with the non-marine mollusca of the Pleistocene 
and Holocene deposits of the counties of Suffolk, Cambridge, 
Northampton, Huntingdon, Hertford, Bedford, and Norfolk (except 
the Forest Bed). 
Sixty-five localities are dealt with, thirteen being new, whilst a 
large amount of fresh material has enabled the authors to make many 
additions and corrections to the previously published lists. Notes 
on some of the more important species are given. 
The authors are of opinion that the evidence furnished by these 
deposits fully supports their previously expressed views as to the 
sequence of events in the Pleistocene period, viz. that there has been 
one glacial period only, and that it occurred at the end of the 
Pleistocene. 
