PEE3TWICH CEAG-BEDS OF STTFFOLK; AND NOEFOLE;. 



339 



of that shell in it. When I again visited it lately to colleet more 

 of the fossils, I fonnd it sloped over. 



The clay contained numerous impressions of the same shells as at 

 Iken, and in the same condition ; but in the sand the shells them- 

 selves were preserved, mostly double and in. the position in which they 

 lived. They consisted of : — 



Cardium. Nucula or Leda. 



Mya truncata. Tellina. 



Crossing the Aide, the hill at the back of Aldborough is capped 

 by the Chillesford clay, vsdth the sands under it, and we again find 

 it at the brick-pit near "Warren House, one mile N, of Aldborough ; 

 but in neither of these places have I found any fossils. Their relation 

 at the latter place, both to the Red Crag and Coralline Crag, is clear, 

 as shown in the following theoretical section : — 



Fig. 20. — Section from the Railivay to the High-road, near 

 Warren House : height about 25 feet. 



a. White sands and gravel. 

 3. Chillesford Clav. 

 3'. Chillesford Sand. 



2. Eed Crag. 



1. Coralline Crag. 



The shell-bed on the side of the road to Saxmundham shows 

 also, apparently, the same relation to the - Chillesford Clay, if we 

 may judge by a bed of clay which crops out near the top of the hiU. 



These Chillesford clays form with the underlying sands the upper 

 division of the Eed Crag. 



Before leaving this district, I must direct attention to some sec- 

 tions of much interest, both on the score of old physical geography 

 and in evidence of the dependent relations of the Eed to the Coral- 

 line Crag. To the first of these sections attention was originally di- 

 rected by Sir Charles LyeU. in 1838. In his description of the Crag 

 at Sutton, Sir Charles pointed out that in the Bullock-yard pit on Mr. 

 Colchester's farm the Eed Crag abuts against the Coralline Crag, 

 and that the latter is perforated by Pholades, showing the existence 

 of an old clifi", and that this cliff was subsequently submerged and 

 covered up with Eed Crag. The further opening out of this section 

 and some other sections on the opposite side of the hiU show that 

 there are two submerged cliffs, that they pass round the hill, and that 

 the mass of Coralline Crag, forming the higher part of the hill, has 

 been an old reef in the Eed-Crag sea. We have additional evidence 

 also showing how great was the denudation and removal of the 

 Coralline Crag, the debris of which is profusely scattered in some 

 adjacent beds of the Eed Crag. The facts were of so much interest 

 that I resolved to have a properly levelled section taken of the whole 



