464 Notices of Memoirs — Stonesfield Slate Section. 



estimate, yet the result of the present investigation has been to 

 prove the presence of an important and overlooked section of the 

 Great Oolite, and to entitle place for it in future accounts of that 

 subdivision. That Prof. A. H. Green doubted the existence of so 

 great a series of beds as those quoted by Prof. Hull is proved by 

 the absence of any account of them in his excellent memoir " On the 

 Geology of the Country round Banbury, Woodstock, Bicester, and 

 Buckingham," published in 1864. 



Mr. James Windoes, Mr. Wilfrid Hudleston, Mr. H. B. Woodward, 

 and your Secretary have also worked in later years at the deter- 

 mination of the equivalent of these lower Bathonian beds in the 

 neighbourhood of Chipping Norton. 



To his Grace the Duke of Marlborough, to the Right Hon. Lord 

 Dillon, to Mr. John Barrett of Stonesfieid, and to Mr. S. Shilson of 

 Charlbury, the thanks of your Committee are due for aid in this and 

 other relative work. 



The probable extension of a lower division of the Great Oolite, 

 great enough to entitle it to a place as a sub-formation, below the 

 limit reached by us 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, Stonesfield, Oxon, 1894. 



Ft. in. 



1. Humus with limestone fragments containing Nerinma, Cryptoccenia 



Trattii, E and H, Cryptoccenia sp., Isastrma microphylla, Tomes, 

 Isastrcea limitata, Lamx., Isnstrcea near to limitata, Lams., Tham- 

 nastrcea Lyelli, E. and H., and Epismilia sp. " Rift Bed" . .09 



2. Grey Marls with Ostrea, Placunopsis, and Rhynchonella concinna . .40 



3. Fawn-coloured Sands and Marls — Oyster bed . . . . .20 



4. Grey shelly compact Limestone, weathering cream-coloured . . .60 



5. Hard grey Marls with Rhynchonella concinna . . . . .09 



6. Shelly Limestone 6 



7. Marl 2 



8. limestone ............ 1 3 



9. Marls with Oysters, etc. . . 2 6 



10. Limestone, shelly Oolitic and cream-coloured " Eoof" of Slate . .18 



11. Stonesfield Slate, " Top hard," compact, grey cr3'stalline . 5 in. to 7 in. 



12. Soft fissile Sandstone " Pendle " 9 in. to 1 ft. 



13. Limestone, coarsely fissile and Oolitic, with clay inclusions, concretions, 



black carbonaceous markings, and fragments of Rhijnchonella and 

 Trigonia impressa . . . . . . . . . .20 



14. Marl, brown fissile and sandy 3 



15. Shelly Limestone, laminated and banded Avith clay inclusions in the 



upper part ; fawn coloured with Oysters . . . . . .23 



16. Soft fissile Sandstone with carbonaceous markings . . . .05 

 17- Limestone, compact, close-grained, fawn coloured, with carbonaceous 



markings and clay inclusions . . . . . . . .76 



18. Limestone, close-grained, buff coloured . . . . . .56 



19. Clay 16 



20. Limestone, compact, buff coloured . . . . . . .28 



21. Marl 4 



22. Limestone, white, shelly, and crystalline, with Mytilus Soiverbyanus 



Rhynchonella concinna, and Ostrea Sowerbyi . . . ■ .13 



23. Black Clay, crowded with Placunopsis in places, with Ferna, Nucula, 



and Ostrea ........... 1 7 



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



passing into a brown, blue-hearted Limestone crowded with shells, 

 Ferna quadrata, large Oyprina, Corbula, and Macrodon . . .20 



