26 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [IToV. 22, 



at Easton Bavent Cliff near Southwold. I visited this spot in 

 October, and was at once convinced, by the identity of the lithological 

 character, that we here have the Chillesford Clay underlain by the 

 Mya-bed. 



Yet at this spot, as at Chillesford Brick-pit, I found no Myas in 

 situ, though single valves occur. Tellina lata, with its valves 

 united, is extremely common, as is also Tellina prcetenuis. 



Immediately beneath the Chillesford Clay we come upon a band of 

 drifted shells, two or three inches thick, containing flints and frag- 

 ments of bone imbedded in a coarse sand, and, beneath this, sand 

 with Tellince as they lived. The bed occurs, where I saw it, at the 

 very bottom of the second cliff north of the farm-house, and was 

 only visible for a few feet, the rest being obscured by talus. 



The following species occur at this spot : — 



Tellina lata. Mactra ovaHs. 



obHqua. Pecten opercularis. 



prsetenuis. Cyprina Islandica. 



Mya truncata. Litorina litorea. 



Leda myaHs. Paludina lenta. 



Mr. Ewen of Southwold, a friend of the late Col. Alexander, in- 

 formed me that this band used to occur twenty-five years ago higher 

 up in the cliff, and to the south of the spot where I found it, but 

 that it had, through the wasting of the cliff, descended beneath the 

 beach at the old locality, owing to the dip of the bed. This is im- 

 portant for my theory, as will appear in the sequel. 



On examining other spots in the neighbourhood of Southwold, I 

 found a pit at a place called Yarn Hill, near Potter's Bridge. Here 

 is a bed of shells, chiefly Tellince in sand. It is covered by a brown 

 loam, which I believe to be weathered Chillesford Clay, a band of 

 flints in sand intervening ; I have no doubt of its being a continua- 

 tion of the Mya-bed seen in the cliff. 



The species found at Yarn Hill were : — 



TeUina obliqua (common). Litorina htorea, 



lata (common). Buccinum undatum. 



prsetenuis (common). Natica catena. 



Mactra subtruncata (common). G-uillemini. 



ovalis (not common). Hingicula buccinea. 



Cardium edule (common). Paludina lenta. 



Cyprina Islandica (fragments). Succinea oblonga. 

 Mytilus edulis. 



On the hills above this pit are pits of Chillesford loam and clay, 

 extensive brick-works being carried on in the latter at Manor House, 

 Frostenden, and other places. At Frostenden brick-kiln the sand is 

 dry beneath the clay, but the Mya-bed appears to be absent. Draw- 



of the same cliff, and appears to have come from some position above the Mya- 

 bed. It fell to pieces. A fourth, now in the possession of Mr. Ewen, was taken 

 from the Mya-bed. It is the tooth of a very young animal. 



Col. Alexander speaks of the occurrence of Crag shells in the talus of Easton 

 Cliff to the south of the outcrop of the Mya-bed. The impression left on my 

 mind is that some patches of Norwich Crag were then existing in the cliff in the 

 position I have assigned to it above the Chillesford Clay, but hidden by talus. 



