LOWEFl GREEN SAND. 



35 



present time (1887) the junction is easily accessible throughout 

 the greater part of the hollow from which the slip has taken place. 

 The section of the Perna Bed is similar to those which have been 

 described before. The base line of the Lower Greensand is sharp 

 and definite, the lower beds are conglomeratic, and the surface 

 of the Wealden Shales shows signs of disturbance and slight 

 erosion. Lastly, the fossils characteristic of each formation are 

 found close up to, but never transgressing the boundary. The 

 Perna Bed is not only visible in the cliff, but reappears in the 

 foreshore below Redcliff Foot, and forms a long straight reef 

 running out to sea a little south of east. 



Southwards from the slip caused by the Atherfield Clay, the 

 cliff consists of ferruginous sands and becomes mural, continuing 

 so until the softer beds of the Sand-rock series are reached. On 

 the yellow and white sands and blue clays of this series there rests 

 a great thickness of Carstone, which passes up into the Gault. 

 A small fault crosses the cliff at an oblique angle at this point, 

 running W. 30° N,, and throwing the beds down to the north. 

 It is best seen in the base of the Carstone, which it crosses about 

 half way up the cliff. 



The Gault forms a small gully descending the cliff obliquely, 

 and occupied by a footpath. This formed a convenient starting 

 point for the following section : — 



Section of the Lower Greensand at Redcliff', 



Ft, In. 



Carstone, 

 72 ft. 9 ins. 



1 



1 



Gault, blue micaceous clay passing down into 



Brown clayey grit, becoming more sandy 

 below ; small scattered pebbles, and a line 

 of pale phosphatic concretions made up of 

 grit and grains of iron oxide 9 feet fi'om 

 the top - - - - - 10 



Pebbly band, with small quartzites - - 



Brown sand with many scattered quartzite 

 pebbles, and phosphatic concretions as 

 above at several horizons. Wavy lines 

 of iron oxide, and some beds with many 

 grains of oxide - - - - ' 



Loose brown sand and grit - 



White sand and blue clay interlaminated 



Do. with occasional lines of blue clay 



Striped sand and clay ... 



Do. chiefly clay and very 



sulphury - . . - . 



Seam of iron oxide . - - . 



Bright-yellow and white sand, with ferru- 

 ginous band at base . _ _ 



Grey striped sand and clay - . - 



White sand . - - _ . 



'Blue and striped sandy clay (?=40 feet clay 



of Blackgang) - . . _ 



Hard brown sandstone ... 



Grey sand, " soot-coloured " - 



Pebbly bands, containing small quartzites, 

 phosphates, and iron oxide - - 2 



c 2 



Sand-rock Series, 



base uncertain, 

 about 93 ft. 6 ins. j 



< 



