230 E. A. WALEORD ON THE " NORTHAMPTON SAND " 



ft. in. 



1. Hurnus 6 



( 2. Flaggy white oolitic limestone 2 



3. Sand weathering white 3 6 



4. Hard cream-coloured limestone, bored in places at the base by 

 Annelids 1 9 



5. Brown sand 1 with Ostrea calceola 11 

 E. ■{ 6. Sandy limestone weathering rusty J and Lima 4 



7. Sands 5 



8. Sandy limestone becoming loose at bottom 2 3 



9. Sand 1 



10. Sandy limestone 1 10 



11 . Coarse gritty sand 2 



12. Sandy limestone 1 3 



Vl3. Sand . . 1 



14. Violet-coloured limestone with plant-remains 1 11 



15. Purplish tenacious clay, sandy 7 



16. Shelly limestone 5 



D.<( 17. Sandy clay 2 



I 18. Hard limestone 1 



I 19. Brown sandy limestone, plant-bed 4 



| 20. Purplish marly clay 2% 



^21. Solt marly limestone and clay 2 



(22. Hard cream-coloured limestone with Asfarte minima 1 



23. Sand 10 



24. Shelly limestone containing Trigonia and corals 1 



B. 25. Sandy flaggy limestone, Ammonite-bed 10 



i ("26. Sandy and blue-hearted limestone with corals 4 6 



A, \27. Bed sand , 3 



28. Upper Lias clay 



Fragments of a higher bed than any in the section and represent- 

 ing conditions not previously recognized in Oxfordshire are shown 

 here and there in rifts caused by the flexure or faulting of the 

 Inferior-Oolite Limestones in their dip towards the valley. The 

 fragments consist of a hard marly limestone, through the grey base 

 of which in some parts are scattered oolite grains of a yellowish 

 colour. It is crowded with small Gasteropods of the genera Gerithium, 

 Kilvertia, Monodonta, and Nerincea ; bivalves are equally prominent, 

 amongst which Mytilus imbricalus and small shells of Astarte (nov. 

 sp.) predominate. Numerous specimens of a fine coral (Cryptoccenia) 

 also occur. The fauna is essentially dwarfed in character, and its 

 relationship is with that of the lower zone of the Great Oolite. 



From the Lower Limestone bed (No. 26) I have obtained Lima 

 punctata, Avicula Miinsteri, JRJiynclionella cynocepliala, and a pro- 

 bably new species of Delphinula. This limestone with the red sand 

 below I have designated series A of the section. The sandy flaggy 

 limestone (B) yields a smooth Ammonite, believed by Mr. Hudleston 

 to be referable to Ammonites Iceviusculus, Sow., as well as Terebra- 

 tala perovalis and T. submaceilZata, Myacites Goldfussi, &c. I have 

 obtained Trigonia producta from the worn and oyster-covered surface 

 of bed 24 (C). A coral band at the base yields magnificent specimens 

 of Clausastrcea Conybeari, Isastrcea serialis and limitata, and Tliam- 

 nastrwa Defranciana. The succeeding layer (bed 22 of series C), 

 an oolitic shelly limestone, has yielded the bulk of the species in the 



