486 
TUE GEOLOGIST. 
bridge over the line. "We also find the coniferous wood near New- 
port- Pagnel associated with TerebratulsB, &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 ( Ujyjjer Zone). 
Localities. 
Name. 
PISCES. 
Hybodus grossiconus, Ag. 
Pycnodus parvus, Ag. 
„ Bucklandii, Ag. 
Strophodus magnus, Ag. ... 
„ tenuis, Ag. 
Sphaerodus 
Strophodus reticulatus, Ag. 
cephalopoda. 
Nautilus Baberii, Lyc. 
Nautilus striatus, Sow. 
GASTEROPODA. 
Bulla undulata. Bean 
Natica Yerneulii, -4rc7i. ... 
„ Sharpei, Mor. and Lyc. 
Natica, sp. 
Nerita hemispherica, Lyc. and Mor. 
Pleurotomaria (small species) 
Nerinsea 
Trochus squamiger, Lyc. and Mor. 
Trochotoma obtusa, Lyc. and Mor. 
CONCHIFERA. 
Myacites decurtata, Goldf. 
„ calceiformis, Fhil. 
„ recurva, Fhil, 
Gayhurst, Bucks. 
Horton, Gayhurst, &c. 
Piddington, Gayhurst, &c. 
Gayhurst, Horton. 
Gayhurst. 
Piddington, Northants. 
Kavenstone, Bucks. 
Gayhurst quarry. 
Ekely, Gayhurst, &c. 
Gayhurst quarry. 
Near Ekely lanes. 
Piddington, Gayhurst, <fec. 
Gayhurst. 
Gayhurst quarry. 
Denton, Northants. 
Common. 
Kavenstone, Bucks. 
Bavenstone, Bucks. 
Gayhurst quarry. 
Denton, Northants. 
Piddington, Northants. 
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