352 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 7, 



that of Bridlington, which is generally held to be the marine equiva- 

 lent of the mammaliferous crag, and from the very small number of 

 extinct species found in the Chillesford deposit, whether it may not 

 possibly belong to a period one step more recent than the mammali- 

 ferous crag ; whether in fact it may not be the marine representative 

 of that thin marine freshwater and land series which on the north- 

 eastern coast of Norfolk is spread over the patches of the Norwich 

 crag, and immediately underlies the great northern clay-drift. 



Note. — The following directions may be useful as a guide to a few 

 of the best and most interesting sections in this district of the Crag ; 

 that is to say, in the small tract of country between the river Butley 

 and the river Aide, especially as it is here that we have the fullest 

 development of the coralline crag. The references are made by the 

 Ordnance Map. 



Coralline Crag Pits. 



Sudbourn Hall, — in the park, one furlong north-west of the house : a 

 large shallow section in the lower part of the coralline Crag, cele- 

 brated for the number and beauty of its fossils, especially its Con- 

 chifera. 



Ditto, — one furlong north-east of the house : higher in the coralline 

 crag; more unproductive in shells, but richer in corals. 



Ditto, — half a mile north-east of the house ; entrance of park at the 

 junction of the Aldborough and Woodbridge roads : rich in corals ; 

 a fine and large section. 



Iken parish ; — Redlands covert, on the south-west corner of, on the 

 borders of Iken marshes : a sniall field-pit ; — thin beds, very com- 

 pact. 



Ditto, — three and a half furlongs west of Calton farm : a fine and 

 large pit. 



Ditto, — north side of Ferry farm-house, one mile south-westward from 

 Aldborough Ferry. This pit exhibits a surface of crag strongly 

 indented by drift-sands and gravel. 



Pits of Coralline Crag, with a capping of Red Crag. 



Sudbourn parish, — near the top of the hill, seven furlongs north-east 

 by east from Sudbourn church. This is a very interesting pit, ex- 

 hibiting a fine section of fifteen feet of red crag, reposing on twenty 

 feet of coralline crag, both abounding with their characteristic 

 fossils. 



Ditto, — exactly intermediate by a line on the map between this last pit 

 and Sudbourn church, by the side of a lane the first turning to the 

 left in proceeding westward from Sudbourn church. This pit also 

 exhibits an excellent section of the red and coralhne crags. 



Ditto : — adjoining and intermediate between these last two pits are 

 several others, some of them of considerable size, but mostly exca- 

 vated in the coralline crag only. 



