326 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Feb. 26, 



ft. 



6. Basaltic sheet (second interposed). 



7. Light-coloured soft sandstones, with horizontal streaks of carbonaceous 



matter towards the base 30 



8. Black sandstones 30 



9. Basaltic sheet (third interposed) ? 



10. Sloping terrace covered with debris of sand-rock, &c. 



11. Inferior Oolite. — A. A micaceous argillaceous sand-rock, with Belem- 



nites veniralis, sand more prevalent above than below ; beds traversed 

 by hard lenticular masses of a semicrvstalline limestone containing 

 Ammonites Murchisonce and Lucina Wright ii. 

 B. Finely laminated sandy micaceous shales, with Belemnites veniralis 



12. Upper Lias. — Black shale, with limestone nodules at top, about 50 



The fossils are Ammonites communis, A. falcifer, Inoceramus ditbius, 



Pecten personatus, and Belemnites of the same slender quadrate 

 forms as occur in the alum shale of Yorkshire. 



13. Middle Lias. — Close-grained hard calciferous sandstone, with intercalated, 



slightly ferruginous bands, and fossiliferous in the lower part chiefly. 

 Thickness indeterminate, as it is continued under the sea-line. The 

 leading fossils are, in the Ammonites-spinatus zone : — A. spinatus, rare ; 

 Belemnites paxillosus, common, B. miorostylus ; Cryptcenia expansa, not 

 rare ; Pecten cequivalvis, common ; Plicatula spinosa, common ; Cypri- 

 cardia cucullata, rare ; Mytilus scalprum, rare ; Rhynchonella tetrahedra, 

 very common ; R. acuta, rare ; Pentacrinus amaltkei, very common. 



The interposed basaltic sheets of this section are found to produce 

 a remarkable alteration in the beds on botb sides, similar to that 

 already noticed in regard to the Camus Inivaig section, and which 

 need not therefore be again described, showing that they are not of 

 Oolitic age, but posterior and intrusive. 



Section YI. 

 Another section a little to the south of the foregoing gave the 

 following succession of beds in descending order : — 



Oolites and Lias. 



1. Estuarine Series : — ft. in. 

 Thin-bedded sandstone, greenish in colour, with lenticular 



calcareous masses : Cyrena Brycei. 



Shell limestones 50 



Black shales. 



2. Basaltic sheet , 35 



3. Estuarine Series : — 

 Shales. 



Earthy and shell limestones.- 

 Shell-beds. 



Blue argillaceous limestones. 

 Shell-beds and shell limestones. 

 Shales. 

 The whole series is very fossiliferous : Neritina staffincnsis, 

 Mytilus, sp.?, Cyrena, fish-remains, Valvata. 



4. Carbonaceous Series : — 



Black shaly sands and sandstones 100 



5. Basalt, 



6. Shales and sandstones ; height above sea about 300 feet. 



7. Fissile shelly calciferous grits. 



8. Gritty sandstone : Ostrea suhlohata, Belemnites gingensis. 



9. Massive sandstone with calciferous bombs. Belemnites. 

 10. Soft sandrock and massive sandstones. 



