LOWER GREENSAND. 25 



bridge by which the military road crosses the chine. It re- 

 appears in the top of the cHff 300 yards south of the chine, and 

 slants down thence to the beach 150 yards east of Atherfield 

 Point, the dip, as calculated from the heights and distances on 

 the Ordnance Map, being 1 in 24, or about 2^°. 



The section of this bed in the cliff is frequently obscured by 

 the slipping of the Atherfield Clay, but is now (1887) admirably 

 exposed 250 yards north-west of the point. 



Section of the Perna Bed near Atherfield Point. 



Ft. In. 



rCalcareous and ferruginous stone, with many 



I fossils - - - - - 2 6 



Perna Bed J ^^^^ fossiliferous clay, based by a gritty seam 

 J with phosphatic nodules and fish-remains. 

 I Panopcea occurs in the clay in the position of 

 t growth - - - - - 2 7 



Wealden Shales (see p. 14). 



5 1 



The brecciation of the top bed of the Wealden, which has 

 been described at Compton Bay, is not observable here, but the 

 line of demarcation between the blue purely argillaceous shale, 

 with its numei'ous bands of fresh or brackish water shells, to the 

 rather sandy clay with numerous marine forms, is sufficiently 

 striking. The gritty base of the clay, moreover, points to some 

 erosion having taken place. The grit varies in thickness rapidly, 

 and is sometimes absent. Dr. Fitton, in allusion to it, remarked 

 that "the remains of fishes, chiefly teeth and small fragments of 



Fig. 9 

 Exogyra sinuata, Sow. 



bones, are mixed with coarse quartzose gravel at the bottom of 

 this bed [the Lower Perna Bed] ; and occurring thus immediately 



