1865.] FISHEE CHILLESPORD BEDS. 23 



I have coloured it on my section as belonging to the sands between 

 the Boulder-clay and the Crag, whose geological position appears as 

 yet not well made out. 



The line of section here crosses the hill obhquely. The Chilles- 

 ford Clay was seen near the top of it, by the side of the road. At 

 the extreme end of the hill, where it sinks beneath the marsh, sands 

 were seen which I beheve to be those underlying the Chillesford 

 Clay. 



Crossing the marsh, the section enters a low cliff towards the 

 Eiver Aide, close to the Aldborough Gas-works. This cliff is com- 

 posed of drifted sands containing frequent small patches of shells. 

 There is one rather constant band of shells about 11 feet from the 

 base of the cKff. It is best seen in a pit by the side of a lane oppo- 

 site the Gas-works. The shells found in the cliff were — 



TeUina praetenuis (very abundant). Cyprina Islandica. 



obliqua (abundant). Mactra ovalis. 



Mytilus edulis. Cardium edule. 

 Mya truncata. 



At 5 or 6 feet above this band of shells, at the top of the low 

 cliff, the Chillesford Clay commences. It is extensively worked at a 

 brick-pit between the cliff and Aldborough Church. The clay is 

 capped by brown sands. 



The Mya-bed is not seen at this spot, but close to the first mile- 

 stone from Aldborough it appears in the roadside-cutting. The 

 species collected there with scarcely any searching were — 



• Tellina obliqua (valves united) Turritella communis. 



Mya truncata. Natica. 



Mactra ovaHs. Calyptrsea. 

 Buccinum imdatum. 



The lower ground hereabouts is occupied by the Coralline Crag, which 

 is exposed in a large pit just on the west side of the line of section. 

 Mr. Wood noticed in the heading of this pit at one place traces of a 

 shelly crag, and at another a patch of phosphatic nodules. We saw 

 also both these. They appeared to have been drifted ; and I have 

 little doubt that the Crag had been derived from the Mya-bed, and I 

 think it very possible that the nodules may have come from the Coral- 

 line Crag itself. We found such in the CoraUine Crag at Sudbourn 

 Park, which renders it not unlikely that an old water-washed sur- 

 face of that rock might yield them. 



The Chillesford Clay is again met with in the Old Aldborough 

 brick-kiln on the rising ground above the Crag-pit. This is. the 

 brick-kiln mentioned by Mr. Wood. 



The clay is here overlain unconformably by brovm sands. 



A tract of low marshy land is now crossed, upon which we saw 

 traces of Coralline Crag, as we thought, dug out of a deep hole. 



The rising ground beyond the marsh, on which to the east stands 

 the hamlet of Thorpe, consists of brown sands. They are rather 

 coarse, and contain ferruginous layers. These sands are exposed 

 in a railway- cutting on the edge of the marsh. A little further 



