COTTESWOLD DISTRICT. 63 
subdivisions may be taken to represent the Olypeus-grit. Here, as elsewhere, the 
great mass of 7’. globata occurs just above the Guisei-bed. This series has afforded 
Mr. Witchell several species of Gasteropoda, including the Nerinea so often 
mentioned and some others. As a horizon therefore it is deserving of some 
notice. Mr. Witchell’s types of N. Guwisei, &c., are, I believe, from this very bed on 
Rodborough Common. 
The next point worthy of notice is the Upper Coral-bed, which according to 
Mr. Witchell has its southward limits hereabouts. The Upper Trigonia-grit of 
this section calls for no special comment. This is the bed that we have seen 
continuously from the neighbourhood of Little Sodbury (Horton Hill). It appears 
to contain but few Gasteropoda here; at least I find no great number in Mr. 
Witchell’s collection from this horizon. For all that, I have very little doubt of its 
being the representative of the rich shell-beds which, further south, have yielded 
such an abundance of Gasteropoda towards the base of the Parkinsoni-zone. 
There are also but few Gasteropoda from the Gryphite-grit, and consequently we 
need not take much trouble to discuss its geological position. Rodborough 
Common is about the last exposure where it contains the characteristic Gryphite, 
whilst further south (Wootton-under-Edge, Horton Hill, &c.) the beds of the 
Parkinsoni-zone rest directly on the Cotteswold Freestones. The Gryphite-grit 
has generally been regarded as belonging to the Hwmphriesianus-zone, but I leave 
this’ question to be discussed elsewhere. The entire Racsrone series, or Upper 
Division of the Inferior Oolite, on Rodborough Common measures about 23 feet, 
whilst the section on Stroud Hill, only just across the valley, has already increased 
to 37 feet (teste Witchell) partly owing to the expansion of the Gryphite-grit. 
Srroup, Swirr’s Hint, anp Loneripce.—These are all on the north side of the deep 
valley which commences at Stonehouse; they may be taken together as constituting 
one section, so to say, of the Cotteswold District. Swifts Hill Quarry is about one 
and three quarter miles north-east of Stroud station near Knapp Farm. There is 
a fault in this quarry, which is mainly in the Freestone series. The Nerincea-bed 
occurs several feet below the soft Oolite Marl. It forms part of two blocks, and 
the Nerinzeas occupy a vertical space of about 2 feet 6 inches. The lower bed is a 
mixture of chalky stuff and oolite, and this is the best for fossils; sections of 
Nerinea are extremely numerous. The quarry at Longridge is on very high ground 
two miles north of Swift’s Hill, and about one mile east of the small town of 
Painswick. The quarry is in such a muddle that no section can be obtained ; but 
the horizon whence the bulk of the fossils are obtained is probably a little below the 
Oolite Marl. A very fine series of Nerinzeas have been procured from this place 
lately both by Mr. Witchell and myself. Taking Stroud Hill as the representative 
section of the region immediately north of the great valley, we obtain the following 
sequence. For further details I would refer to Witchell’s Geology of Stroud, p. 5. 
