278 



Dr. FiTTON on the Strata below the Chalk. 



Escarpment, Shotover Hill. 



Ochre ; about 8 feet above the sand, 1. 



1. Greenish-sand {Portland). 



2. A bedof concretional masses of grit. 



3. Greenish sand. 



4. Beds of clay, about 3 feet thick. 



5. Sand. 



6. Great nodules of grit, with Perna qua- 

 drala, &c. 



7. Greenish yellow sand. 



Below is Kimmeridge clay. 



(145.) The beds connecting the Portland strata with the subjacent Oxford 

 oolite are exposed, in detached places, on the descent of the hill from Gar- 

 sinffton to Lanscombe and Gasson's Barn, where the following strata occur, 

 beneath a considerable thickness of whitish sand, which, however, is probably 

 a part of the Portland group. 



Pits near Langcombe. 



Ft. In. 



1. Soil, including carstone. 



2. Rubbly stone {Portland). 



3. Yellowish sand, with petrifac- -] 



tions and calcareous matter inter- > 1 

 spersed ' 



4. Sand, with Trigoniae; concreted"! 

 at the bottom J 



5. Sand, including at the bottom 6. . 



6. Stone, in irregular concretions. . 



7. Sand; continuous (except where"! 

 there is stone) with 5. and 9 J 



8. Concretional stone. ... 6 feet to 



9. Sand, as above. 



Total thickness 15 to 20 



[The preceding part of this section 

 represents the Portland stone and 

 sand of Mont Lambert in the Bou- 

 lonnois.] 



10. Clay, (Kimr.ieridge) about 12 



11. Blue grit in irregular concretions, "I „ g 

 with shells and stems of Siphonia?/ 



12. Clay continuous with 10.; when 

 dry, it is yellowish brown, ap- ^ 40 

 proaching to ochre yellow . . about 



This clay rises slowly towards 



Ft. In. 



the quarries at Langcombe, the di- 

 stance of which from Garsington is 

 about a mile. 



After a thickness of between 40 and 

 50 feet of clay as above mentioned, 

 there were, at Gasson's Barn, the fol- 

 lowing beds, abounding in Pectens and 

 other smaller shells. 



1. Rubble full of broken shells .... 



2. Rubble, somewhat slaty. . . .about 



3. Coarse yellowish sand, with whitish 

 ranges, containing numerous frag- 

 ments of shells 



4. Stone in concretions 



5. Sand nearly as above, but finer, "1 

 somewhat concretional J 



G. Stone; a congeries of shells, mixed 

 with sand concreted by calcareous 

 matter, and containing black flint 

 pebbles, Pernas, numerous small 

 Gryphites and Pectens, and large 

 flat bivalves. 



7. Sand connected with 5 



The lower part of this group seems 

 to represent the Weymouth beds, or 

 the upper part of the Coral rag. 



1 



10 



1 6 



2 



2 6 



(14G.) Kimmeridge Clay. — In one of the quarries at Headington, the 

 clay over the Oxford oolite was thus : — 



Clay-pits, Headington. 



1 . (Surface) " Loam" 5 6 



2. " Brick-claij," with fragments of Oysters and Gryphites: — about 3 feet from bottom,! ^ g 



full of small shells J 



3. " Blue-stone," in concretions, on an average about a foot in thickness 1 



