280 LOWER OOLITIC ROCKS OF ENGLAND : 
their structure in much smaller quantity, and more slowly, and, on 
escaping, carries away but little lime in solution."* 
Lycett mentions that " In one curious instance a large Nautilus was 
severed by a joint, and the divided portions remained a yard apart on 
opposite sides of the chasm. "f 
The lower beds of Great Oolite are evidently thinner at Min- 
chinhampton than they are further east near Sapperton. Prof. 
Hull notes their thickness as varying from 20 to 40 feet. The 
total thickness of the Great Oolite was estimated to be 120 feet 
by Morris and Lycett. This would include the Kemble Beds, 
which are probably not exposed in the Minchinhampton quarries, 
the upper beds (there seen) belonging to the White Limestone 
subdivision. 
West of the Folly at Minchinhamptou, the following section 
was opened in beds mapped by the Geological Survey as Forest 
Marble, but which I should include with the Great Oolite : 
FT. IN. 
I" Thin pale, false-bedded and shelly 
Great Oolite I oolites, with sandy layers and small 
(Kemble Beds ?). ] hard calcareous and sandy nodules 5 6 
I Pale oolite. 
This nodular bed occurs in the Upper Bee's of the Great 
Oolite, and may be compared with that noticed in the railway- 
cutting south of Sapperton tunnel. It is probably not far above 
the beds shown in the Minchinhampton quarries. The stone is 
quarried for building walls, for road-metal, &c. 
The following section of the beds at Bussage, west of Chalford, 
was noted by E. WitchellJ : 
FT. IN. 
"[Kemble Beds.] Bubbly oolite - - - 7 
f Buff limestone, with casts of Na- 
I tica, Purpuroide:i, &c. - -30 
White limestone - - 6 
Wh't 1 P ac % riSmft> bed, consisting princi- 
T . < pally of shells of Pachyrisnta 
grande - - 1 
White limestone, with casts of Na- 
tica - - - 2 6 
White freestone. 
The only other locality where the Pachyrisma has been found 
is at Ccwcomb Hill, south of Chalford. Among other fossils that 
have been obtained from Bussage, are the following: Astarte 
flcxicostata, Gervillia ornata, Pecten Woodtcardi, and Sowerbya 
Woodivardi. 
Reference has been made (p. 279) to the incoming of beds of 
the character of Stones-field Slate in the vicinity of Stroud and 
Minchinhampton. Witchell observed that " In a well sunk on 
Stroud Hill, in connection with the Water Works, the lower part 
* Mollusca of Gt. Oolite (Pal. Soc.), p. 2. 
t Quart. Journ. Geol. Soc., vol. iv. p. 184. Lycett remarks that the term 
" Lissens " is applied by the quarrymen to the open joints in 1he strata. 
J Geol. Stroud, p. 77. 
