PEBBLE GRAVELS, 
203 
other fossiliferous sections. One of these was in a small pit two- 
thirds of a mile north-north-west of Southwold Church, close to, 
and on the eastern side of, the road to Lowestoft. Here Mr. 
Whitaker obtained nine species of mollusca, hut there is the same 
uncertainty as to their real age, as in the case of those from the 
Southwold sections. The other locality was discovered by Prof. 
Prestwichj who found in a pit close to the north-east edge of 
Reydon marshes , . , . a seam of the same pebbly sand 
concreted by oxide of iron. This seam was full of the casts and 
impressions of Mytilus edulis in all stages of growth, and many 
of the shells double.”* Crag crops out near this spot, so the seam 
with mussels may belong to the lower strata, not to the Pebbly 
Series. 
The sections of the Pebbly Series just described include all 
those in Suffolk that have yielded fossils. Evidence of the mode 
of origin, and of the age of the deposits, seem, therefore, to be 
entirely wanting. I cannot help agreeing with the last opinion 
expressed by S. Y. Wood, that in this district only derived 
fossils are found. The one locality where mussels occur may be 
an exception. 
Inland, west of Southwold, the Pebbly Series crops out on each 
side of the valley of the Blyth, some of the best sections occiuTing 
in the Wangford tributary valley. A pit near Wangford shows 
well the irregular junction with the glacial gravel, and also the 
difference of character between the two deposits (Fig. 48). 
Pig. 48. 
Section in a Gravel Pit N.E. of Wangford. 
(W. Wliitakcr.) 
1. Gravel and sand. The gravel irregular, composed largely of flint pebbles, 
but also with pebbles of chalk ; partly coarse, and with large flints and other 
stones (Glacial Drift). 
2. Sand, with layers of pebbly gravel, bedding flat, reaching up to about 8 feet 
above the bottom of the pit. 
Near Hales worth station Mr. Dalton notes that the strata 
change to '' a thick mass of grey pebbles, in a matrix of sand, a 
* Quart. Journ. Geol. Soc., vol. xxvii., p. 462. (1871.) 
