Proceedings. x1x 
eastern end the cutting showed chalk covered with pipes of 
Thanet Sand, and redeposited Woolwich Clay with flint pebbles ; 
near the working face at the north-western end the Thanet 
Sand seemed to occur in mass. A point of interest, however, 
in this cutting was the way in which the chalk had been worn 
toa series of pinnacles, divided by holes or pipes penetrating 
almost down to the level of the railway; in some cases the pin- 
nacles rise to within four or five feet of the surface. 
«Thence the party walked to the present working face south 
of the Walton Road Bridge, and to the site of the Walton Station, 
passing what remained of the section figured below. Returning 
on the western side of the cutting, the party saw a fairly good 
section of Thanet Sand with an undulating surface, and two or 
three pinnacles of chalk standing up init. On the south side 
of the Walton Road Bridge, but on the opposite side of the cut- 
ting, the strata in the cutting were the same as those previously 
seen on the north side of the bridge, but the movement that had 
taken place owing to the destruction of the chalk was more pro- 
nounced on account of its occupying less space longitudinally. 
The Directors pointed out that, though the Thanet Sand was 
marked in the Drift Edition of the Geological Survey Map as 
covering a large patch of the surface of the ground about here, 
at no spot in these cuttings did it reach the surface, except in 
the case of some pipes at the northern end. 
«After tea at Walton Mill the party proceeded to a small 
sand-pit on Headley Heath, containing sand and a gravel largely 
composed of flint pebbles. The gravel occurs in isolated patches 
on high ground from Netley Heath eastwards, and is of un- 
certain age. Walking southward, the party reached the edge 
of the North Downs, near Betchworth Clump. Thence they 
descended to the chalk-pits, which, we believe, had not previously 
been visited by the Association. Here was seen a section em- 
bracing a large part of the Middle and Lower Chalk. The 
Directors pointed out in descending order; (1) the zone of 
Echinoconus subrotundus, equivalent to the zone of Terebratulina 
gracilis, which does not seem to occur here; (2) the zone of 
Rhynchonella cuvieri, called by the quarrymen ‘ Burr Chalk,’ and 
~ equivalent to the Melbourn Rock; (3) the zone of Belemnitella 
plena, a very distinct narrow band round the quarry, and forming 
the top of the Lower Chalk; and (4) the zone of Holaster sub- 
globosus. The distinction between zones 1 and 2 was very 
easily seen on one side of the pit. The marked difference in 
character between the massive thickly-bedded Middle Chalk and 
the more thinly-bedded and marly Lower Chalk was well seen.” 
8rd. May 6th.—To Tilburstow chert-pits. The object of this 
excursion was to see the long line of pits on the dip-slope, dug 
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