Dr. FiTTON on the Strata below the Chalk. J 95 



[^Lower green-sand.^ 



1, 2. Loosely coherent sand and sand-rock. 



3. Dark sand or silt, like loose black mud. 



4. Sand-rock like 1 and 2, in homogeneous 

 blocks. 



5. Black mud-like sand. 



6. A great bed of sand, loosely coherent, like 



1, 2, and 4, in blocks about 6 feet thick. 



7. Loose black mud or silt, much like 5. 



8. Mere loose sand, without cohesion. 



9. Black earthy sand, rising on the shore about 



900 paces east of the Chine, and forming 

 the bed over which the streamlet falls. 



In the following detail of the strata, the distances are measured, in both directions, from the 

 middle of the Chine, as being one of the most remarkable points of the shore. 



Thickness 

 Paces. _ in Feet. 



850 to 500, — east of the Chine. Yellow agglutinated sand above, passing below into a dark") 

 muddy silt. It has no green earth in it. This bed forms the upper stony-looking laver over I 

 ■which the water falls at the Chine. " r ~" 



The bottom goes out at 350 paces west of the Chine ; 15 — 20 feet thick. J 



0. M\dd\e o{ Blackgang Chine. 



560 east, to 240 west of the Chine. Sand, full of green earth. The second or middle stony- -i 



looking bed of the fall, which has there a convex surface 1 20 



Bottom goes out at 590 west of the Chine J 



240 east, to 400 west of the Chine. Very dark or almost black sand, forming the base of the -i 

 cauldron of Blackgang ; coloured red externally by the action of water and air on the ferru- 1 1 5 

 ginous matter which it contains Goes out at 1040 west of the Chine. J 



400 west of the Chine, to 520. Black slaty clay or mud, like mashed slates, without solidity "1 

 of aggregation ; decomposes into muddy earth. , Goes out at 1130 west. J ' 



500. Hereabouts are very remarkable stems of Siphonia?. 



[This part of the shore, about 500 paces north-west of the Chine, is called Cliff-End.^ 



520 to 614. Green-sand closely intermixed with ferruginous layers and much pyrites, which"! ^ 

 give it compactness and solidity Goes out at 1420 west, j "^ 



614 — 768. Three feet at top, forming a transition from the last stratum, by alternation with t 

 the following. Below, 10 feet consist of deep green, almost black, and very uniform sand ; 1 13 

 without fossils Goes out at 1520. J 



768 — 812. Rugged ferruginous sand, of a brown colour Goes out at 1580. 7 



812 — 1090. 1. Mixed green and yellow sand, very dark, including Gryphcea sinuata, in very 

 hard tough lumps Thickness, 4 feet. 



2. A second bed, at the bottom of which is a layer of Gryphcea sinuata 1 foot. 1-12 



3. Mixed brown and green sand, including detached specimens of G^rT/^jA. sinuata..? feet. 



The bottom of this group goes out at 1800. 



1090 — 1360. Very green sand, softer than the last. Cliff mural. Lines of false stratification I 

 at the top This bed goes out on the east side of Walpen Chine about 1910. j 



1360 — 1590. Brown green-sand, much like the last, but different in cohesion ~[ 



Goes out at top in the east side of Whale Chine, at 2480. J 



About 1431, a copious spring has, in its fall, coloured the whole face of the cliff with a 

 broad red streak. The whole seems to be greenish grey sand, and clay ; very dark and 

 moist. The cliff continually scales off in great flakes, which are washed away, so as 

 not to form much talus. Red drip frequent 



1590 — 1800, Sand, with layers of great flattened and oval concretions of very tough calci- "i 

 ferous stone, 2 feet in diameter. [^Quce. like the Cowstones of the Devonshire coast*] . . !> 12 



Goes out at 2660. J 



* See De la Beche, Geol. Trans., 2nd Series, vol. ii. p. 113. 



