446 



PKOCEEDINGS OE THE GEOLOGICll. SOCIETY. [Mar. 28, 



ft. in. ft. in. 



Red marl and thin courses of 



stone 2 



Green and variegated marl 2 



Red laminated marl 6 



Red sandstone 4 



Variegated marl, with concre- 

 tions of calc-spar 1 



Sandstone , 5 



Red marl 5 



Sandstone.... 1 6 



Concretionary grey stone, with 



small pebbles and probable 



traces of vegetables 7 



Grey and yellow marl 6 



Band of carbonate of lime 0^ 



Indurated grey marl 10 



Compact grey limestone 11 



Green marl 1 



Coarse green limestone 3 



Green marl 1 



Redmarl 7 



Sandstone 2 10 



Redmarl 1 4 



Red marls, with layers of gypsum, succeed, and continue to the 

 base of the section. 



48 10* 



3. In descending order, the 

 the upper Till or Drift) — ■ 



ft. 



1. Green clay. Cypris (rather 

 sparingly). Teeth of Hybodus, 

 and scales of Lepidotus 1 



2. Grey stone. Small Modiola . 5 



3. Blue, variegated, and green 



clay. Cypris (rare). Hybo- 

 dus. Lepidotus ,1 



4. Stone 1 



5. Green clay. Cypris. Estheria. 

 Lepidotus, &c 



6. Stone 



7. Dark clay. Cypris. Lepido- 



tus. Hybodus 



8. Stone ( = " Bone-bed") t. 

 Teeth and spines of Hybodus 

 minor. Teeth, jaws, and scales 

 of Lepidotus. Sphenonchus 

 Martini, Ag. Teeth and ver- 



section at Lihksfield * shows (under 



ft. in. 

 tebrse of Plesiosaurus, &c. 

 Small Univalve and Bivalve 



shells. Remains of Plants... 3 

 9. Blue clay. Cypris, abundant. 



Fish-remains, rare 4 



10. Stone 1 4 



11. Green maid {Estheria occurs 



id some of these lower beds) 9 



12. Stone 10 



13. Green marl 2 10 



14. Stone 10 



15. Green marl 2 



16. Stone 8 



17. Green marl 5 



18. Boulder-clay 5 



19. Cornstone 12 



20. Reptiliferous Sandstones (?). 



The author next offered some observations on the red layer of clay, 

 sand, and stones intercalated between the Linksfield shales and the 

 cornstone ; and, not accepting Capt. Brickenden's opinion % of its 

 having been thrust in by the action of ice against the escarpment 

 during the formation of the Boulder-clay, he suggested that an early 

 glacial period, contemporaneous with the Lower Lias, destroyed 

 some of the lower shales and limestone of Linksfield, leaving their 

 remnants imbedded in a red drift to be covered by the succeeding 

 undisturbed deposits of the bone-bed series. 



Mr. C. Moore next remarked that the Cornstone at Linksfield, on 

 which all the above-mentioned beds rest, might possibly be of 

 Triassic date, as he had observed on the flanks of the Mendips and 

 elsewhere a stone, of a similar aspect, belonging to the Trias, and 



* See also Mr. P. Duff's Section in his " Sketch of the Geology of Moray," pi. 3. 

 t See Mr. P. Duff's " Geology of Moray," p. 64, pis. 4 & 5. 

 \ Quart. Journ. Geol. Soc. vol. vii. p. 289. 



