486 



THE GEOLOGIST. 



bridge over the line. We also find the coniferous wood near New- 

 port- Pagnel associated with Terebratulse, &c. ; but frequently the 

 fossils are in a fragmentary state and not easy of identification. 



We now come to the Upper Zone of the Great Oolite, which 

 attains by far the greatest development of any formation in the 

 district, and by far the largest number of organic remains, as the 

 following list will testify. It consists, throughout, of hard white 

 limestone, freestone, and blue clay. The freestone is used for 

 building and other economic purposes, and when in this form, the 

 Great Oolite exactly corresponds with the " Bath Oolite," having 

 just the appearance of that stone as seen in the vicinity of Bath. 

 The Upper Zone of the Great Oolite extends over a large tract of 

 country, and is in many places of considerable thickness, and has a 

 general dip towards the east. As it is found in large massive blocks, 

 in most places, it is, unlike the Cornbrash and Forest-marble, well 

 adapted for building and other purposes ; consequently there are many 

 more quarries opened in it than in the above-mentioned formations. 



Fossils from the Great Oolite ( Upper Zone). 

 Name. Localities. 



PISCES. 



Hybodus grossiconus, Ag. 

 Pycnodus parvus, Ag. 



„ Bucklandii, Ag. 

 Strophodus magnus, Ag. ... 



„ tenuis, Ag. 

 Sphserodus 



Strophodus reticulatus, Ag. 



CEPHALOPODA. 



Nautilus Baberii, Lye. 

 Nautilus striatus, Sow. 



GASTEROPODA. 



Bulla undulata, Bean 

 Natica Yerneulii, Arch. ... 



„ Sharpei, Mor. and Lyc. 

 Natica, sp. 



Nerita hemispherica, Lyc. and Mor. 

 Pleurotomaria (small species) 

 Nerimea 



Trochus squamiger, Lyc. and Mor. 

 Trochotoma obtusa, Lyc. and Mor. 



CONCHIFERA. 



Myacites decurtata, Gold/. 

 „ calceiformis, Phil. 

 „ recurva, Phil. 



Gayhurst, Bucks. 

 Horton, Gayhurst, &c. 

 Piddington, Gayhurst, &c. 

 Gayhurst, Horton. 

 Gayhurst. 



Piddington, Northants. 

 Bavenstone, Bucks. 



Gayhurst quarry. 

 Ekely, Gayhurst, &c. 



Gayhurst quarry. 

 Near Ekely lanes. 

 Piddington, Gayhurst, &c. 

 Gayhurst. 

 Gayhurst quarry. 

 Denton, Northants. 

 Common. 



Bavenstone, Bucks. 

 Bavenstone, Bucks. 



Gayhurst quarry. 

 Denton, Northants. 

 Piddington, Northants. 



