370 Mr^ Lyell 07i the Boulder Furmatio7i, 



terized by broken crag shells, and in one place some flint 

 pebbles, h, occupying the space of several layers of loam. 



Fiff. 17. 



clay and 

 loam, 

 loose sand. 



Section %feet high of vertical and curved drift in the cliff near Runton. 



Between the Runtons and Sherringham, and at a short 

 distance from the latter place, are seen strata of vertical drift, 

 on the one side of which are horizontal, and on the other 

 curved and folded beds. The change in these cases from 

 the horizontal set to the vertical is very abrupt. 



Crag near Weyhourne. — It is not until we arrive within less 

 than two miles of Weybourne, that the Norwich crag appears 

 in considerable force in situ above the level of the sea, in a 

 cliff about 30 feet high, between Old Hythe Gap and Wey- 

 bourne. At two different points I observed the chalk in con- 

 tact with several feet of shelly sand and clay containing peb- 

 bles and the fossils of the Norwich crag without any inter- 

 vening breccia or " pan." This crag was covered with clay 

 and loam without shells. 



About half a mile from Cliffend, Weybourne, the following 

 section appeared, in a vertical cliff about 40 feet high, where 

 I saw the greatest thickness of crag abounding in shells : 

 1st, horizontal chalk with flints, 8 feet; 2ndly, sand and flint 

 pebbles with crag shells, 1 foot ; 3rdly, fine sand with perfect 

 crag shells, 10 feet; 4thly, sand and pebbles without shells, 

 3 feet; 5thly, unstratified clay or till with flints, 10 feet. 



The following is a list of the shells obtained from this crag: 

 Fustis siriatus, Littorina littorea, L. squalida (var. of prece- 

 ding?), Purjncra crispata, perhaps var. of P. lapillus, Cyprina 

 isla7idica, Cardium edzde^ Cardium echinatum ? Tellina obliqiia, 

 T. soUdida, Nucula Cobboldice, My a arenaria F Mactra, Astarte. 



