uttii Marlborough Railways. 



177 



II. The Marlborough Railway. 

 The cutting in the Upper-green-sand at Savernake Station, where 

 the Marlborough Railway commences, has already been noticed. 

 At a quarter of a mile from this spot, the junction of the Upper- 

 green-sand and Chalk-marl is passed over, but no section is visible. 

 At Lye Lane there is a good section through part of the Lower-chalk, 

 here consisting of hard thick-bedded stone, dipping north 8". Ino- 

 ceramus latm, Pecten quinquecostata Pecten Beaveri, Turrilites 

 tuberculatus, Rhynconella Gibbsii, Ammonites varians, Ammonites 

 Mantelli, and sharks teeth were found here. 



Upper-chalk. .rB-^::^!^^:^; Jn the deep cutting near Lye Hill, the 

 / / ^^ "^ ^^E ^- upper beds of the Lower-chalk, capped by the 



1^-^ r f chalk-rock are well seen. The chalk-rock 



•J forms a division between the Lower,andUpper- 

 Z \ chalk ; it is very constant in its occurrence, 

 ^— I and from its greenish yellow colour it is 

 •{J easily recognised. Here it is 10 feet thick 

 and divided into five beds, fig. 4. The Lower- 

 chalk in about 8 inches passes into a band 

 of hard rubbly stone, coated green, in which 

 are nodules of Iron pyrites, causing rusty 

 stains. There is then a sharp line, and over 

 this a bed of hard chalk 2 feet 6 inches thick, 

 of the colour of the Lower-chalk, capped 

 with a dark marly seam about 4 inches thick, forming another 

 well marked divison. The ordinary Lower-chalk is then resumed, 

 but soon gets yellow, and in 3 feet passes into another band of 

 green coated lumps of hard chalk like the first. At 2 feet above 

 this, another similar but less marked band occurs, and at I foot 

 above this latter another like it. Then comes a bed of hard 

 rock 1 foot thick, on which is a well marked band of green coated 

 rubbly stone 3 inches thick. Over this begins the Upper-chalk. In 

 these greenish yellow bands, there is a gradual deepening of colour 

 from below upwards, and then a sudden break, and return to the 

 ordinary colour of the chalk. 



The beds of rock, and the rubbly lumps are much harder than the 



VOL. IX. — NO. XXVI. o 



Fig. 4. 



