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obtained from Ravensgate Hill according to Dr Wright. On page 
579 (73) Dr Waagen says—“‘The Gryphea Grit cannot be 
exactly correlated by the species of fossils which have up till 
the present been obtained from it, although it most likely also 
belongs to the zone of Am. Sowerbyi, while the Upper Trigonia 
Grit represents the zone of Am. Parkinsoni, and probably also 
the zones of Am. Humphriesianus and Am. Sauzei. The beds of | 
Rolling Bank Quarry, Cave Hill, North End, from which Wright 
quotes Am. Humphriesianus, Gervillii, Brocchui, Braikenridgu, 
appear to me to be rather the representatives of a portion 
of the Upper Trigonia Grit than as Wright thinks of the 
Upper Freestone, as otherwise Am. Sowerbyi must in the 
Cheltenham district occur higher than Am. Humphriesianus and 
Am. Gervillii.” 
In the Notgrove district and in Dorset the division between 
the Upper and Lower portions of the Inferior Oolite would be 
in this way similar, viz., at the base of the Parkinsoni zone, or 
of the Humphriesianuwm, when present. When the latter is 
absent, the division is very marked in both places, but if we 
draw the line at the similar division (Bored Bed) in the Stroud 
area we draw it below the Gryphza Grit, and consequently 
below, as I say, the Sowerbyi zone. My contention is that 
to draw the division in the Stroud district below the Gryphea 
Grit is to draw it at a totally different place to what it 
is drawn in Dorset, and causes the inclusion of the Sowerby: 
zone of the Cotteswolds, in the Upper Division. There- 
fore, although we have scarcely any break of a marked 
character between the Upper Trigonia Grit and the Grypheza 
Grit in the Stroud district, yet having regard to other localities, 
and to the fauna that the beds exhibit, we must, to place them 
on the same horizon as the beds in Dorset, draw our line of 
demarcation between these two deposits. In that case we 
draw a most marked line of division in the middle of Lycett’s 
Spinosa Stage, and if my idea be correct that the Gryphza Grit 
belongs to the Sowerby: zone, and the Trigonia Grit to the 
Parkinsoni, and the zones of Am. Sauzei and Am. Humphries- 
ianus are absent, it follows that the division of Spinosa Stage 
