] 870.] AVHITAKER — SOUTH UOESET AND DEVON CHALK. 95 



Lower f Chalk-rock nodules, at a ledge running out into the shingle-beach. 

 Chalk. I Chalk without flints. 

 Chalk Marl, more or less hard. 



Upper Greensand. — Green-grey and partly hard. Along the top of the cliff 

 the top part of this is calcareous, and passes up into the Chalk Marl. 



At Lulworth Cove the fallen state of the cliff hid much of the 

 accessible part of the section ; but the grey soft layer at or near the 

 top of the Chalk Marl was to be seen. 



In Man-of-war Cove I could not see the Chalk-rock at the eastern 

 part, where the junction of the Upper and Lower Chalk seems to be 

 much confused. Westward, however, the nodules of the rock are to 

 be seen up to a height of 5 feet above the beach, when they are cut 

 off by Chalk, again with confused bedding, soon succeeded by Chalk 

 with flints, also somewhat confused. Still further west the nodules 

 again occur, and the Upper Chalk is less than 80 feet from the Upper 

 Greensand, the bedding of which latter and of the Chalk Marl is 

 reversed, being at an angle of about 70° S.S.W. instead of north- 

 wards. The Chalk Marl seems at one part to be 45 feet thick. It 

 has the usual darker clayey bed at top, whilst the bottom 2 feet or 

 more contains dark grains, small brown nodules, and grains of 

 quartz. The top part of the Upper Greensand is hard from its large 

 irregular-shaped nodules of chert ; and the topmost 2 feet or more is 

 sometimes a buff cherty sandstone. 



At the eastern end of Durdle Cove the dip of the Ch.alk Marl and 

 the Upper Greensand is still reversed southwards, at an angle of 80°. 

 The former, with its grey soft layer near the top, is succeeded by 

 Chalk with a few flints ; and, indeed, there is one layer of flints less 

 than 20 feet from the Upper Greensand, and therefore in the Chalk 

 Marl, which, however, is here not clearly separable from the Chalk 

 above. A little westward the Chalk with flints comes on ; and the 

 bedding is confused at the bottom of the cliff, as in Man-of-war 

 Cove. On turning the corner, into the deeper part of the Cove, a 

 cream-coloured and partly greenish layer of nodules (like those of the 

 Chalk-rock) may be seen. Beyond this the frequent layers of flint 

 show a southerly or reversed dip of about 65°, soon changing to a 

 higher angle, and afterwards to a curved dip in the other direction, 

 30° at the top, and 60° or more at the bottom of the cliff, as shown 

 in fig. 1. 



Fig. 1. — Section of the Chalk tvith Jiints. Eastern side of Durdle 



Cove. 



/ X 





Beach-line. b. Fallen earth. 



Chalk with Flints. d, Nodule-layer. 



