306 REPORT — 1894. 



the limit reached by us, large enough with that already discovered to 

 entitle it to a place as a sub formation, makes a continuance of the work 

 a necessity for the right understanding of the lower Jurassic rocks of 

 Great Britain. 



Section at the S.W. end of Covert, Stocky Bank, Stonesjield, Oxon, 1891. 



Ft. 111. 



1. Humus with limestone fragments containing Nerincea, Crypto- 



ccenia Prattii E and H, Cryptoccenia sp., Isastrcea microjjhylla 

 Tomes, Isastrcea limitata Lamx., Isastrcea near to limitata 

 Lamx., Thamnastrcea Lyelli E and H and Epismilia sp. 

 ' BlFT BED ' 



2. Grey Marls with Ostrea, Flacunopsis, and Jihy7ichoneUaconcinna 



3. Fawn-coloured Sands and Marls — oyster bed .... 



4. Grey shelly compact Limestone weathering cream-coloured . 



5. Hard grey Marls with Rhynchonella concinna . . . 



6. Shelly Limestone ......... 



7. Marl 



8. Limestone .......... 



9. Marls with Oysters, &c. ........ 



10. Limestone, shelly oolitic and cream-coloured ' Roof ' of Slate . 



11. Stonesfield Slate, 'Top hard,' compact, grey crystalline , Sin. toO 



12. Soft fissile Sandstone ' Pendle ' 9 in. to 1 



13. Limestone, coarsely fissile and oolitic, with clay inclusions, 



concretions, black carbonaceous markings and fragments of 

 Rhynchonella and Trigonia impressa ..... 



14. Marl, brown fissile and sandy ...... 



15. Shelly Limestone, laminated and banded with clay inclusions 



in the upper part ; fawn coloured with Oysters . 



16. Soft fissile Sandstone with carbonaceous markings . 



1 7. Limestone, compact, close-grained, fawn-coloured with carbon- 



aceous markings and clay inclusions ..... 



18. Limestone, close-grained, buff-coloui'ed ..... 



19. Clay 



20. Limestone, compact, bufF-coloured ...... 



21. Marl 



22. Limestone, white, shelly and crystalline, with Mytilus Sower- 



byanus, Rhynchonella concinna, and Ostrea Sowerhyi . .13 



23. Black Clay, crowded with Rlacunopsis in places, with Perna, 



Nucuia, and Ostrea . , . . . . . .17 



24. Shelly earthy Limestone, made up mainly of Oyster fragments, 



and passing into a brown, blue-hearted Limestone crowded 

 with shells, Perna quadrata, large Cyp)rina, Corbula, and 

 Macrodon .......... 2 



25. Black Clay Oil 



26. Hard oolitic Freestone, blue-hearted, made up of whitish oolites 



in blue or brown base . . . . . . . .20 



27. Rubble 3 



28. White fine-grained Limestone with few shells . . ,12 



