498 TRANSACTIONS OF SECTION C. 
In view of these facts, we may perhaps expect that further research will show 
some constant difference between the facies of the igneous rocks in areas where 
subsidence was continuous and the facies in areas where subsidence was inter- 
rupted by uplift. The greater the extent of the uplift the more clearly may it 
be expected to express itself in the composition of the contemporaneous igneous 
rocks; so that in areas where phases of uplift played an important part the rocks 
may be expected to belong to types transitional between typical spilitic and 
typical calcalkaline rocks. 
5. Recent Discoveries in the Stockingford Shales near Nuneaton. 
By V. C. Intine, B.A., F.G.S. 
During recent mapping of the sub-divisions of the Stockingford shales 
between Nuneaton and Merevale, fossils have been found at various horizons 
which indicate that the Cambrian succession in this area is almost, if not quite, 
complete. 
Among these fossil-bearing horizons are the following :— 
1. Lower Purley Shales.—Shales from a surface working 200 yards south of 
Worthington Farm, near Hartshill, contain fragments of Olenellus. The fossili- 
ferous beds are forty feet above the base of Purley shales. 
Mr. Pringle, of the Geological Survey, has found Olenellus in nodules at the 
base of the Purley shales in Jee’s Sett Quarry (Summary of Progress, 1913). 
2. Lower Oldbury Shales.—(a) Excavations in Hartshill Hayes have proved 
that the basal ninety feet of the Oldbury shales are of Menevian age. They con- 
tain the zones of Paradoxides Davidis and P. Hicksii in their upper and middle 
beds, while the lower beds contain Agnostus atavus, and correspond with Tull- 
berg’s Ag. atavus zone, and with part at least of the Lower Menevian of Sweden. 
The V'rilobite fauna includes the genera Paradozides, Anopolenus, Conocoryphe, 
Holocephalina, Iiostracus, Microdiscus, and Agnostus, no less than fifteen species 
of the last genus having been found. At the top of the series there occurs a 
calcareous conglomerate, containing fragments of the underlying type of shale 
and indicating a probable unconformity. 
(6) In a new cutting near Oldbury Reservoir Olenus truncatus and Ag. 
pisiformis var. obesus occur, proving that these beds are of Upper Maentwrog 
age. 
Between the Maentwrog and Dolgelly horizons a series of curly bedded flag- 
stones have been detected. These are very similar to the Ffestiniog flags, and 
their position would seem to indicate that they are of Ffestiniog age. The beds 
are badly exposed and have yielded no fossils up to the present. 
Thus the Oldbury shales represent a large proportion of the Cambrian succes- 
sion, and in view of this fact, and also of their extreme thickness (2,000 feet), 
I propose a further sub-division of this group, the classification of the whole 
succession being as follows :— 
Merevale Shales Lower Tremadoc. 
Monks Park Shales. . . Dolgelly. 
Oldbury Shales Fr Moor Wood Flags and Shales Ffestiniog. 
ey : G Outwoods Shales. . Maentwrog. 
1. Abbey Shales . . . . Menevian. 
| UEper ; 
Purley Shales . Menevian ? 
| Camp Hill Grit. 
Hartshill Quartzite . . ) Tuttle Hill Quartzite 
Park Hill Quartzite 
* | Taconian. 
1 roeee cali ; 
