secretary's report. 
479 
called plains of marine denudation, but he preferred to call them 
plains of marine arrestation, the main work being done by rain, 
rivers, and frost, whilst the sea determined the level beyond 
which this action could not go, and plained away the final slice. 
Professor Hughes alluded to the contrast between the stretches 
of bare rock in some places, where the wa^ es had been able to 
scour freely, and the pockets of conglomerate, where hollows had 
been ready to receive the debris. These pockets formed the base- 
ment beds of the Carboniferous so well seen in this district. 
Attention was called by the Chairman, and also by Mr. 
P. F. Kendall (Leeds), to the interesting glacial phenomena of 
the neighbourhood and to the great systems of faults. 
A paper on " The Millstone Grit and Yoredales of the Calder 
Valley" was read by Mr. James Spencer (Halifax). Mr, Spencer 
adduced evidence to show that there was no real palieontological 
break between the lower Yoredale beds and the Coal Measures, 
and described the arrangement of the strata along the course of 
the Calder from Halifax across the Pennine anticlinal. 
A short paper on " Some Fish Remains found in the Yorkshire 
Millstone Grits" was read by Mr. Edgar D. Wellburn (Sowerby 
Bridge). The specimens of Acanthodes Wardi described consisted 
of the pectoral fin spine from Boulderclough, found by Mr. Thomas 
Salten stall of Sowerby, and others found b}' Mr. P. F. Kendall, 
at Eccup. The second species described was Acroleins Hopkinsi 
which had been found in black shale about the centre of the 
Middle Millstone Grit at Eccup. 
The second day's excursion consisted of an examination of 
Norber Brow and Crummack Dale. The route taken was along 
Thwaite Lane and up ]N"orber Brow, in order to investigate the 
height to which the Silurian boulders have been carried by the 
ice which passed down Crummack Dale. Many Silurian grit 
boulders were found lying round the base of Norber in a long 
trail, which was probably a moraine of the glacier. From this 
point the boulders were traced across the bare limestone clints, 
and were found in great profusion on the lower ridges of 
Norber, lying in two or three parallel lines, which were evidently 
