210 
THE GEOLOGIST. 
namely, some shales and sandstones underlying the rock which he regards as the 
basenient-bed of the " Dogger" or Inferior Oolite. 
These arc — 1. (njiperniost) Shales with Tcrcbmtula trilineafa, Behmnites 
compressus, B. irrcr/iclaris, and Trir/onia Ramsayi. 2. Sandstone, yellow, 
with TurriteUa, IViijonia, Aslarle, Ammonites concavng, A. variabilis, &c. 
3. Yellow Sandstone or Serpula-l)ed. 4. Grey Sandstone or Lingula-bed, 
with Linyvla Beanii, Orhicula, Belcmnites coniiiressus, B. irregularis, Ammonites 
Moorci, &c. 
The author then obseiwed that the Inferior Oolite in the South of England 
admits of a pala^ontological subdivision into three zones, having the Fuller's Earth 
with Oslrea acuminata above, and the Cei>halupoda-bed with Ammonites opulinus 
beneath : — 1st (uppermost), the zone of Ammonites Parkinsoni ; 2d, zone of Am. 
Ilumphriesiamis ; and 3d, zone of Am. Murchisonce. He then described the lowest 
of these zones, that of Am. Murchisonce, giving as synonyms "Dogger" (part), 
Young and Bird, and Phillips ; " the central and lower division of the Inferior 
Oolite," Murchison ; " Fimbria-stage of the Inferior Oolite," Lycett ; " Brauner 
Jura p," Quenstedt ; " Calcaire la>donien" (part), Marcou ; " Calcaire a en- 
tro(]ues," Cotteau ; " die Schichten des Am. Murchisona;," Oppel. The Leck- 
hanipton section was then described, as illustrating tins zone, which was also 
described in its details as seen at Crickley Hill, near Cheltenham, and at Beacon 
Hill ; also at Frocester Hill and Wootton-under-Edge. 
The preceding sections exhibit the lithological character and stratigraphical re- 
lations of the Pea-grit and Freestones, which, however, undergo great and very 
important modifications when examined over even a limited area, — the Pea-grit 
as regards its structure ; and the Freestone, its thickness. In the Southern 
Cotteswolds the Pea-grit loses its pisolitic character ; and in the eastern part of 
the hill district the Freestones thin out and finally disappear ; the Inferior Oolite 
being represented at Stow-on-the-Wold and at Burford by the zone of Ammonites 
Parhinsoni, with its light-coloured ragstones, filled with an abundance of Clypeus 
Plotii, Klein, and forming a " Clypeus-grit." 
The fossils of the Pea-grit anil Freestone, and of the Oolite-marl or Fimbria- 
bed, were then enumerated. The Oolite-marl was described as having been pro- 
bably derived from the debris of a Coral-reef : its Nerina-an limestone was parti- 
cularly alluded to. 
The section at the Peak near Robinhood's Bay aflForded the author the equiva- 
lents of the zones of A m. Humphriesianus and A m. Murchisonce, and was described 
in full. 
The zone of Am. Eumplmesianvs was next treated of. Its synonyms are " In- 
ferior Oolite of Dundry Hill," Conybeare and Phillips ; " Grey limestone, Bath 
or Great Oolite" (Yorkshire), Phillips ; " Eisenrogenstein (part) und Walk-Erde 
Gnippe," Fromherz; "Brauner Jura 7 und 5," Quenstedt; "Calcaire fermgi- 
neux," Terquem ; " Blaue Kalke, Korallenschicht, Giganteus-Thone, und Os- 
trcen-Kalke" (Quenstedt), Pfizenmeyer. The best types of this zone, so well 
characterised by peculiar Gasteropods and Cephalopods and its ferruginous oolitic 
grains, are seen in the section at Dundry Hill, at Yeovil and Sherbourne in 
Somerset, and at Biulion-Bradstock and Ghideoak in Dorset. Just as the thinning; 
out of the Murciiisonfe-zone and the absence of the Humpliriesianus-zone near 
Burford and other localities in the N.E. parts of the Northleach district brings the 
Parkinsoni-zone nearly into juxtapusition with the clays of the Upper Lias, so the 
thinning-out of the Murchisonre-zone at Dundry Hill brings the zone of Am. 
II amphriesianus into close relation with the " Sands of the Upper Lias," and has 
caused it to be mistaken for the " Cephalopoda-bed " of Frocester and Leck- 
hampton Hills. In the northern Cotteswolds the Humphriesianus-zone is but 
feebly represented. 
The Dundry Hill section was then described in a note by Mr. R. Etheridge, 
F.G.S., as comprising, — 1st (lowest), Lower Lias ; 2d, perhaps the "Lias Sands;" 
3d, the Shell-bed ; 4th, Ammonite-bed (not equivalent to the " Cephalopoda-bed" 
of the Cotteswolds) ; 5th to 9th, shelly beds, ragstone, fine-grained oolite, and 
freestone ; some of the latter representing the Parkinsoni-zone. 
Dr. Wright then described tlie section in Gristhorpe Bay, from the Combrash 
