EED CKAG. 
93 
be placed on colour. At the western part of the pit the process 
of dissolution of shells was shown, the shelly Crag in places 
passing into a sort of marl, and there being many more or less 
vertical marly veins, the marl being the result of the dissolving 
away of shells from the sand. At the bottom of the pit there 
are springs, and the London Clay occurs at the lowest part.”* 
Continuing northward along the right bank of the River Deben 
we come to the extensive coprolite pits of Waldringfield—a well- 
known locality for Red Crag fossils. 
'‘The large coprolite-working north-east of Waldringfield 
Church, which was nearly given up in 1876, except close to the 
road, gave the following section :— 
Glacial Drift.—Gravel and sand, at the highest part; up to 8 feet thick, 
with soil. 
f Loamy ferruginous bedded layer, partly mottled. 
Eed J Sand, some fine. 
Crag. I Shelly Crag. 
iRodule Bed; said to be up to 4 feet thick in places. 
London Clay touched (not seen by me).” 
" Mr. Stollery, the foreman, who had a large collection of 
shells from the Crag, told me that the working had been carried 
to a depth of about 40 feet; that, in places, some six inches of 
Coralline Crag had been got beneath the nodule-bed; and that 
he had found Pholas shells bored into the London Clay to a 
depth of some inches.”t 
About a mile southward from Martlesharn Church, is the site 
of an old coprolite-work, showing gravel over sand and shelly 
Crag; and it is probably here that Messrs. Wood and Harmer 
noted the section reproduced in Figs. 15 and 16. 
Pigs. 15, 16. 
Sections in a Pit, South of Martlesham,% 
(S. Y. Wood, jun.) 
c. Pipe of sand crossing both altered and unaltered Crag. 
h. Bedded sands, = a, altered, 
a. Shelly Crag. 
X Layer of flint-pebbles, running through both shelly Crag and sand. 
The sections up the Fyn valley need not be described, and we 
can also pass over the intervening country and take at once the 
classical localities of Sutton and Shottisharn. On the east side of 
the Deben, the Red Crag outcrops continuously from Woodbridge 
to the Butley River, rising to a considerable height above the sea 
and occupying large areas at the surface. Its thickness varies 
greatly, owing to the inequality of the surface on which it was 
* Geology of Ipswich, pp. 63, 64. 
t Ihid,, p. 65. 
j Reproduced from Quart. Journ. Geol. Soc.., vol. xxxiii., p. 75, through the 
kindness of the Council of the Geological Society. 
