The Carboniferous Succession heloio the Coal-Measures. 445' 



III. — The Carboniferous Succession below the Coal-Mbasuees 

 IN North Shropshire, Denbighshire, and Flintshire. 



By Wheblton Hind, M.D., B.S., F.R.C.S., F.G.S., and John T. Stobbs, F.G.S. 



{Continued from the September Number, p. 400.) 



(xxviii) The road from Llanarinon to Graianryd practically tra- 

 verses the whole limestone sequence. The following fossils were 

 obtained from the quarry about half a mile north of Llanarmon, by 

 the roadside, where some 20-30 feet of limestone was exposed : — 



Cyathophyllmn Murchisoni, E. & H. Martinia glabra (Mart.). 



Dibunophyllum sp. Froductus Cora, I) 'Orb. 



Syringopora sp. P. hemisphericus, J. Sow. 



Athyris expansa, Phill. F. punctatus (Mart.). 

 Ghonetes aff. comoides (J. Sow.). (Like 

 the mutation in Di of the Bristol area.) 



In the quarry opposite the Stag Inn, east of Llanarmon, limestone 

 beds with Productus giganteus (Mart.) are well exposed. 



A few hundred yards further east there is a quarry in a farmyard 

 with thin rubbly and bedded limestones. Here Productus giganteus 

 (Mart.) occurs in several bands, with Cyathophyllum and Amplexi- 

 zaphrentis. A little further up the wood occur dark thin-bedded 

 limestones, with bands of Productus hemisphericus (J. Sow.), P. 

 giganteus (Mart.), and Lithostrotion irregidare, Phill., on which lie 

 yellow calcareous shales with Productus giganteus (Mart.). 



(xxix) The next section is at Graianryd, which shows soft yellow 

 sandstone, with occasional quartz pebbles and pebbly grit. The 

 sandstone is very fossiliferous, and contains — 



Camarotoechia trilatera (De Kon.). Fragment of a large Nautiloid. 



Productus longispinus, Soav. Fish-teeth (fragments 2 Psephodiis). 



Spirifer bisulcatus. Sow. 



This bed, evidently, is the equivalent of the coarse pebbly grit and 

 soft sandstone with fish-teeth seen at Gwernymynydd [ante, p. 398). 

 (xxx) Half a mile south-east of Graianryd, at Pant-y-terwyn, on 

 the west of the road, is a fine quarry in cherts, which evidently 

 succeed conformably the calcareous pebble grit, and we there get 

 the following sequence : — 



Cherts (of Pant-y-terwyn) . 



Calcareous pebbly grit (of Graianryd). 



Carboniferous Limestone, Avith Productus giganteus (Mart.) near the Stag Inn. 



Some of the latter series, however, are not exposed. This sequence 

 agrees well with that at Gwernymynydd, and shows the transition 

 from the Cherty Limestone near Pentre Halkyn (p. 396), through 

 the calcareous grits of Hendre and Gwernymynydd, to the pebble 

 grit of Graianryd. It is this part of the series that is represented by 

 the lower part of the Cefn-y-Fedw Series of G. H. Morton.' 



(xxxi) The neighbourhood of Minera affords sections of prac- 

 tically the whole of the Carboniferous System up to the horizon of 



1 G. H. Morton : " The Carboniferous Limestone and Cefn-y-Fedw Sandstone of 

 the Country between Llanymynech and Minera," 1879. 



