TIIK BASAL ROCK-GKOUPS OF SHKOPSHIliE. 1 j? I 



and keeps to the N. for some distance ; finally it curves ubru])lly, 

 and runs straight to the N.W., nearly (or quite) reaching the fault. 

 Thus is formed an oblique parallelogram, whose north-western side 

 is wanting and whose eastern angles are rounded oif. All the dips 

 slope inward, and the centre of the figure is occupied largely by 

 dolerite. South of this figure the dips are to the X.E. and N. of it ; 

 while in the centre of the hill the dips are very variable. 



(g) IL'hnetli Hill. — There are no good exposures, except along 

 the summit-ridge, which is mostly occupied by grit and halleflinta. 

 A red band in halleflinta displays a north-westerly strike, but I do 

 not like to rely upon it and have not inserted it in the map. 



(h) Hazier Hill. — At the northern end, a banded argillite strikes N, 

 and S. This Longmyndian strike occurs within 70 yards of the true 

 Longmynd slate with the normal trend. On the eastern side of the 

 hill, a small quarry exposes a good section of volcanic beds, dipping 

 to the N.W. In ascending order, the strata are purple fine-grained 

 ash, ]jale green porcellanite, coarse grey ash, and fine-grained grey 

 ash. The beds are very irregular, and thin out like wedges. This is 

 one of the most Pebidian-like sections that I have seen in Shrop- 

 shire. 



(i) Rar/leth Hill. — The rocks forming the mass of this hill are 

 very sedimentary, consisting mainly of argillite and grit, with some 

 halleflinta. I have not found in it any igneous rock except intrusives. 

 At both the north and south ends the strikes are about N.W. by W... 

 but in both cases the beds at their eastern ends curve round and 

 keep along the eastern side of the ridge with a I^.I^.E. strike. We 

 have thus another figure similar to the imperfect parallelogram in 

 Caer Caradoc, the north-western side, as in that case, being absent, 

 and the dips being inward. 



(k) The Cardington and Hope-Bowdler Mass. — The materials of 

 this group of bills are like those of Caer Caradoc, with certain differ- 

 ences. Coarse grits are abundant towards the N.W. part ; felspar- 

 porphyry and rhyolite predominate towards the S. and S.W. Strikes 

 are recorded on the map from nine principal localities. !N'ear the 

 Gaer Stone, one strike is E. and W., another is to the N.W. North- 

 east of Hope Bowdler a conspicuous band of felspar-porphyry 

 trends east and west. Just at the back of the village this rock is 

 well exposed in a farm-road, and the strike is quite clear, bands 

 with numerous porphyritic crystals alternating with more compact 

 seams. The strikes in grit in the ravine opposite " The Yells '' 

 and in AVoodgate Quarry have been already noticed. In the glen 

 above Woodgate, a thick band of rhyolite strikes parallel to the 

 grits (E. and W.), and the lavas and ashes in the quarry run in the 

 same direction. South-west of " Middle-Hill " Farm, hiiUeflintas at 

 several spots have a strike to W.X.W., in others to N.W. Towards 

 the eastern end of the massifs at Stone Acton, there have been noted 

 in halleflinta one strike to E.N.E. and one with an E. and AV, 

 trend. 



Some of these strikes are, for volcanic rocks, of considerable 

 length. Thus, the green grit of Woodgate Quarry reappears on the 



