511 
Qucirt% Rock of the Lickey Hill &c. 
regions of the new red sandstone formation, to the entire bulk of 
which they often contribute no inconsiderable proportion.* 
The pebbles thus imbedded in the regular strata are less exposed 
to observation than where they occur in their more common and 
obvious state of superficial gravel, having been again tom up from 
their lodgement in the new red sandstone, by the last diluvian 
waters, and spread over the surface of the plains of the midland 
countries in quantities that are quite enormous, and dispersed 
indiscriminately without reference to the age or substance of the 
rock which lies beneath them. At Cannock Chace in Staffordshire, 
and at Coleshill on the east of Birmingham, the accumulation of 
these pebbles is particularly striking; nor are these places far distant 
from the Shropshire chain of the Wrekin and Caer Caradoc, from 
which it has been suggested a large proportion of them may have 
been primarily derived ; the rocks of Charnwood Forest might also 
be supposed to have supplied many of the slaty and porphyritic 
pebbles that are found mixed with those of quartz rock, without ob- 
liging us to refer their origin to the more distant mountains of Wales. 
* A good example of these pebbles imbedded in regular strata of the young sandstone 
formation, may be seen three miles east of Kidderminster, on the road to Hagley, where 
beds of fine grained red sand alternate with others that are full of quartzose pebbles; 
they may be seen also in the summit of the hills which overhang the Severn on the east 
of Bridgenorth, and in those immediately south of Bewdly on the road to Stourport ; 
and again in the deep section afforded by the road side immediately under the town of 
Nottingham. In the hill called Trempley Green, three miles north-west of Kidderminster, 
and at the quarries at Quatford and Alveley, between Kidderminster and Bridgenorth, 
are similar strata of siliceous pebbles, mixed with others that are calcareous, and forming 
with them a pudding-stone united by a strong calcareous cement. The limestone pebbles 
contain fragments of anomiae and encrinites, and were probably derived from the 
transition chain of the Wrekin and Wenlock Edge, and broken down by the same 
disturbing forces that affected the neighbouring quartz rock, with the fragments of 1 
which they are intermixed. These calcareous fragments have been already alluded to in 
the notes on cornstone. 
