ROCKS OF SHROPSHIRE. 655 
the slope of the hill this greenstone is overlain by beds of Caradoc 
sandstone. 
9. The Lawley. 
Deiwils—The centre of the hill is a mass of greenstone. At the 
Summit is a dark-green basalt. On the north-west slope the rock 
is coarsely crystalline, and is very similar to the greenstone opposite 
Cound-Moor quarry. The crystals of white felspar imbedded in a 
dark-green matrix give the rock a speckled appearance. In parts, 
where the greenstone is decomposed, mica and cubic iron pyrites are 
seen. Following the ridge towards the north-east from the summit 
we come, above Yew-T'ree House, to a grey felspathic breccia, which 
is continued for some distance to the north-east extremity, where 
coarse tuff, striking east and west in bands across the ridge, is 
broken through by black basalt. At the south-west end a red fel- 
sitic rock occurs. 
The Lawley is bounded by faults on both sides. On the west lie 
the Coal-measures of Leebotwood ; on the east runs a parallel valley 
excavated in Shineton Shales. At the south-west end quartzites are 
seen dipping away from the hill, and lapping round for some dis- 
tance to the east and north-east. Just below the quartzite at Cow- 
ley Farm, where the ridge breaks down into the ravine to the south- 
west, is a small exposure of grey grit with Caradoc fossils. The 
strange position of these beds will be perceived when it is observed 
that this fragment is separated from the Caradoc escarpment of 
Hoar Edge by an intervening ravine hollowed out in upper Cam- 
brian rocks (Shineton Shales). 
Summary.—A south-west ridge, composed of an intrusive mass of 
greenstone, with Precambrian tuffs and felstones at each end, 
lapped round by quartzites on the south-west and south, and bounded 
by faults on all sides. 
10. Caer Caradoc. 
Details—The N.E. spur, called Little Caradoc, is mainly com- 
posed of intrusive rock. At the north-eastern extremity is a mass 
of greenstone extending for several hundred yards along the ridge ; 
it is large-grained, the plagioclase prisms sometimes reaching nearly 
an inch, and is strongly distinguished from every other greenstone 
in the district. Resting on it to the 8.W. are some slaty beds of a 
flinty texture ; they are of slight thickness, and are disturbed by 
the intrusion of the greenstone. The remainder of Little Caradoc 
is chiefly composed of fine-grained greenstone. 
In the neck uniting this spur with Caer Caradoc proper the 
ereenstone is highly altered ; it is spotted with spherical concre- 
tions of radiated epidote. In some of the nuclei calcite is crystal- 
lized with the epidote. A similar rock extends for some distance 
along the ridge towards the summit. Quartz is sometimes substi- 
tuted for the calcite in the amygdaloids. 
The structure of the main mass is very varied. At the summit, 
where the remains of an ancient camp are visible, is a light-coloured 
2x 2 
