J. E. Marr — Glacial Deposits, 



263 



present time (March, 1887). The Chalk, which is worked to a 

 depth of many feet, is succeeded by the clayey green sand with green- 

 coated flints, referred by Mr. Whitaker to the Thanet Sands. The 

 bed is partly removed at one point, near the north end of the section, 

 but elsewhere it has its full thickness, which, is ascertained where 

 the green sand is succeeded by an upper deposit resting conformably 

 upon it ; this is the red clay, B^ of Fig. 2, which only occurs in one 

 part of the pit underneath a remarkable ridge of Eed Crag to be 

 now described. The ridge is marked C in Fig. 1, and an enlarged 

 sketch of it is given in Fig. 2. The lower part consists of the 



Fig. 2. — Enlargement of the Crag Eidge in Fig. 1 (Mr. Green's Pit). 



-BJ 



A 



Boulder-clay. 

 Sand and ffravel. 



^1. Chalk. 



£^. Green clayey sand ) mt, v. c ;i 



^3. Eed clay ^^ J Thanet Sand. 



CK Pebble bed. >j 



C*. Hard dark brown very ferruginous gi'avel 



C^. Bleached (yellow -green) sand 



C*. Eust-red sand, not laminated 



C^. Eust-red sand, very finely laminated 



C^. Bleached (yellow-green) sand in the drift 



pebble-bed with phosphatic nodules described by Mr. Whitaker 

 (Q.J.G.S. vol. XXX. p. 401). This is marked C^ in Fig. 2. Next 

 above it is a coarse sandstone C" with a few pebbles, the whole being 

 hardened by a ferruginous cement which gives the rock a very 

 dark-brown colour. The united thickness of these beds is about 2 feet 

 6 inches. The main part of the ridge is formed of about 8 feet of 

 fine incoherent quartz- sand, stained rusty red at the summit, but 

 bleached to a pale yellow-green hue at the base. The bleached part 

 C^ and the lower portion of the unbleached part C* are devoid of 

 lamination planes, though some planes of deposition are visible ; but 

 the top of the ridge C^ is formed of a finely-laminated sand, the 

 laminee being quite regularly inclined at a very low angle towards 

 the south. It will be seen that not only are the bedding planes 

 between the Chalk and the Thanet Sands, and between the latter 

 and the Eed Crag, quite regular, but that the divisional planes of 

 stratification and lamination in the latter, which stands up as a ridge 

 in the middle of the drift accumulations, are absolutely undisturbed. 



