ROOM III. LONDON AND BRIGHTON RAILWAY SECTION. 



213 



il 

 n 



-1 3 



represented the Tertiary of the London 



basin resting on the chalk; the Chalk of 



the North Downs, dipping northwards; the 



anticlinal position of the Wealden; the Chalk 



of the South Downs, dipping southwards, 



a with Tertiary strata on the southern flank: 



> then the depression which forms the chan- 



g nel of the Solent sea; the Tertiary strata 



extending over the northern portion of the 



5 Isle of Wight; the Chalk Downs of the 



2 island, dipping northward ; and, lastly, a 



; small portion of the Wealden, emerging from 



\ beneath the chalk, on the south coast, at 



" Brook and Sandown bays. 



LONDON AND BRIGHTON RAILWAY SECTION. 

 * A portion of this section is well displayed 

 g along the line of railway from London to 



1 Brighton. Leaving the station at London 

 Bridge, the Tertiary clays with their charac- 

 teristic fossils, are seen from beyond Dept- 

 ford, by New Cross, Sydenham, &c. ; and 

 approaching Croydon, beds of gravel appear, 



| with interspersions of olive-green sand. The 

 "* valley beyond Croydon, along the side of 

 | which the railway proceeds, is a thick bed of 

 gravel resting on the chalk. 



2 Beyond the station called Stoats-nest, is a 

 i fine section of the Chalk with flint, and the 



* T North Downs are perforated by a long tun- 

 | nel carried through the solid rock, which 

 ^ g emerges near Merstham, where the firestone 

 ^ Z and chalk-marl rise to the surface. The 



sands and clays of the greensand group 

 =2 are passed at the Red-hill and Godstone 

 ! 9 - stations. The Wealden clays appear at 

 ^ Horley, and are succeeded by shales, lime- 

 to stones, sands, and sandstones, to the Crawley 



station. 1 



1 The Horsham Railway, which branches off from the Brighton line, 

 traverses the Wealden beds ; and near that old quiet market-to 



