Vol. 69.] BATHONIAN ROCKS OF THE OXFOED DISTRICT. 



489 



Great Oolite. 

 fBed 



Thickness in feet inches 



1. Cream-Cheese Bed (often largely removed by 

 erosion prior to the deposition of the Forest 

 Marble). This consists almost entirely of amor- 

 phous carbonate of lime, without shell-fragments 



or oolitic grains Oto 



Bed 2. Fossiliferous Cream-Cheese Bed. Thisbed 

 merges into the above, but is distinguished from it 

 by the presence of numerous shell-fragments ; the 

 following fossils occur : — Nerinaa eudcsii Mor. & 

 Lye, Modiola imbricata Sow., Pinna cancellata 

 Bean, and Terehratula sp 4 



j Bed 3. Compact fine-grained limestone, with occasional 



ooliths 3 



I Bed 4. Yellow marl ; fragments of Echinobrissus sp. 



common 



I Bed 5. First Terehratula Bed: a marly limestone 



I, crowded with T. (Epithyris) bathonica S. Buck. 



Well-marked eroded surface. 



o 



-5 



Bed 6. Compact white limestone, with occasional ooliths . 1 

 Bed 7. Second Terehratula Bed: a marly, friable, 

 fossiliferous limestone, yielding T. (Epithyris) 

 bathonica S. Buck., Modiola imbricata. Sow., 

 Lima cardiiformis Sow., Plagiostoma (?) punc- 

 tatum (Sow.), Echinobrissus woodwardi Wright, 



and Trigonia sp 



Bed 8. Creamy white limestone, with a few Nerincea 1 



Bed 9. Nerincea Hock, a compact limestone almost 

 entirely composed of specimens of Nerincea aff. 



funiculus Desk, in a marly matrix 1 



Bed 10. Soft marly limestone, with fragments of Phola- 



domya, Modiola, and Nerincea 1 



Bed 11. Freestone. This is the highest bed from which 

 Clypeus mulleri Wright, has been obtained ; 

 Nautilus subtruncatus Mor. & Lye. also occurs... 1 

 Bed 12. Marly parting, very persistent throughout the 



Beds cutting 



13 to 20. Eight beds of compact limestone, with few 



fossils 8 



Bed 21. Roach Bed. This bed has been described by 

 Mr. Barrow as follows x : — ' A somewhat siliceous 

 limestone from which the fossils are dissolved 

 out, . . . leaving a curiously porous-looking rock.' 

 The bed is highly fossiliferous, but the fossils 

 occur mostly as casts, and are ill-preserved ; the 

 following have been identified : — Nerincea aff. 

 funiculus Desk, Gy2»'ina,s\>., Corbicella bathonica 

 Mor. & Lye, Lima cardiiformis Sow., Gram- 

 matodon hirsonensis (d'Arch.), Modiola imbricata 

 Sow., Pleuromya goldfussi Lye, and Trigonia sp. 



6to8 



1 Proc. Geol. Assoc, vol. xsi (1909-10) p. 42 ; & ' Summary of Progress of 

 the Geological Survey for 1907 ' Mem. Geol. Surv. 1908, p. 150. 



2k2 



