INFERIOR OOLITE SERIES: COTTESWOLD HILLS. Ill 
The principal sections of the Inferior Oolite Series along the 
western Cotteswold Hills are exposed at Uley Bury, and Coaley, 
near Dursley ; at Selsley Hill, Rodborough, and Stroud ; at 
Haresfield and Randwick ; Painswick, Birdlip, and Crickley ; 
Leckhampton, Ravensgate and Lineover Hill?, and Cleeve Cloud. 
In preparing the lists of fossils from the several subdivisions 
of the Inferior Oolite, I have made use of the works of Lycett, 
Witchell, and others, and have been guided also by the species I 
have myself obtained. 
The subdivision into zones of the Inferior Oolite of the Cottes- 
wold Hills is attended by as much difficulty as elsewhere, and the 
comparative rarity of Ammonites no doubt increases the difficulty. 
It must be remembered that we are seeking for divisions where 
none may exist in nature ; hence there is little chance of adopting 
any grouping that can be regarded as definite. The lower beds 
belong to the zone of A. MurchiioricB (including with it, as we 
have done elsewhere, the sub-zone of A. Soicerbyi) ; and the 
upper beds belong to the zone of A. Parkinsoni. The source of 
trouble in the Cotteswolds, as in Dorsetshire and Somersetshire, 
is the zone of A. humphriesianus, for this horizon is as imperfectly 
developed, or as vaguely marked oflfj in the Cottesvvolds as in more 
southerly parts of England. The species occurs, though sparingly, 
both in the Upper Freestone and in the overlying beds belonging 
to the Gryphite Grit; hence Dr. Wright placed the one sub- 
division, and E. Witchell the other, in the zone of A. humphrie- 
sianus. Evidently in this as in other regions the so-called zone 
is but a connecting link between the zones of A. Murchisonce and 
A. ParMnsoni ; and the beds in which A. hiimphriesianus is 
found are put sometimes in the Lower and sometimes in the 
Upper division of the Inferior Oolite. For practical purposes we 
might disregard it, although it is well to indicate its probable 
position. 
Mr. S. S. Buckman is indeed disposed to place the Gryphite 
Grit in the sub-zone of Ammonites concavus (Sowei-byi-zone), and 
to regard the Upper Trigonia Grit as the base of the zone of A, 
Parkinsoni ; but he admits that "we hc*ve scarcely any break 
of a marked character between the Upper Trigonia Grit and the 
Gryphsea Grit in the Stroud district."* He has stated that in no 
part of the Cotteswolds is the zone of A. hiimphriesianus repre- 
sented, but that view depends to some extent upon the interpreta- 
tion of species. I have obtained one example of the fossil from 
near Chipping Campden, and Prof. Tate recognized the species 
from Stroud. 
A more particular account of the local subdivisions of the 
Inferior Oolite may now be given. 
PEA GRIT SERIES. 
Resting upon the Cephalopoda Bed, there are beds of coarse 
ferruginous oolite, brown sandy limestone, rough freestone, and 
* Proc. Cotteswold Club, vol. ix. pp. 130, 132, and 374. 
