442 
LOWER OOLITIC RCCKS OF ENGLAND : 
There are several quarries near Ilodbotirne, and also at Corston, 
south of Malmesbury, where about 9 feet of shelly and pasty 
limestones, with marly layers, are exposed. Avicula echinata 
occurs here, but fossils are not abundant : m the neighbourhood 
of Foxley they are more plentiful. The Cornbrash is quarried 
at Charlton, north-sast of Malmesbury, and Prof. Buckman 
notes the occurrence of Waldheimia digona in the Cornbrash of 
the neighbourhood. To the east of that town the total thickness 
of the formation was noted as but 6 feet by Prof. Hull,* but as a 
rule it is not less than 15 feet in the area between Chippenharo 
and Malmesbury. 
FIG. 130. 

Section north-west of Kemble Junction, Gloucestershire. 
4. Kellawajs Beds. 
3. Cornbrash. 
2. Forest Marble clay. 
1. Great Oolite. 
The deepening of the lane north of Great Barn, near Kemble 
Station, to allow of a bridge being made for the new railway, 
afforded the following section (Fig. 130) : 
Kellaways 
Beds. 
Cornbrash 
f Grey clay with traces of hard "1 
I Stiff bluish grey clay - 
IT 
FT. IN. 
about 10 
Forest Marble - { 
Brown friable loam (at junction) 
f Eubbly marly rock and marly clay 
- < Eubbly and hard shelly limestone 
I More fossiliferous rubbly limestones 
cla P assin S down into stiff 




The Kellaways Beds and Cornbrash were not previously 
known to exist at this spot : but they occupy a very limited 
area. The highest beds are faulted against the Great Oolite : thin 
and fairly horizontal beds of which were exposed to a depth of 
3 feet, nearer to the Great Barn. 
The junction of the Cornbrash and Forest Marble was 
irregular the clay -being -hollowed out in channels with pockets 
of Cornbrash rubble, evidently the result of comparatively recent 
meteoric action. Among the fossils of the Cornbrash I obtained 
the following species : 
Avicula echinata. 
Pecten vagans. 
Myacites. 
Homom}'a. 
Waldheimia obovata. 
Terebratula intermedia. 
Serpula. 
Geol. parti of Wiltshire, &c., p. 18. 
