1853.] JUKES CARADOC SANDSTONE. 179 



merated by Prof. M'Coy ; they are few in number and peculiar. 

 The slates that occur at the top of the Bala rocks in the neighbour- 

 hood of Llanfyllin and Meifod contain several species identical with 

 those of Bala, but their fossil contents are not yet fully worked out. 

 There are many Upper Silurian species, as already stated by Prof. 

 Sedgwick, and occasionally Pentameriis ohlongus. 



Lastly, the Caradoc sandstone of Denbighshire, taken at three 

 localities not far from Llanrwst, presents the following fossils : — 



Calymene Blumenbachii. Strophomena compressa. 



Phacops caudatus. depressa. 



Downingiae. Atrypa reticularis. 



Beyi'ichia tuberculata. Rhynclionella micula. 



Holopella gregaria. borealis ? 



Mytilus unguiculatus. Chonetes sarcinidata. 



Clidoplioi'us ovalis. Spirifer plicatellus. 



Nucula levata ? elevatus. 



Leptsena sericea. Area Edmondiiformis. 



transversalis. Encrinite stems. 



Orthis elegantula. Favosites alveolaris. 



virgata ? Stenopora fibrosa. 



These fossils are by no means characteristic of the " Caradoc sand- 

 stone of Shropshire" [now ascertained to belong to the Bala and 

 Llandeilo group, July 1853], and, with few exceptions, are species 

 found in Upper Silurian strata. Prof. Sedgwick formerly referred these 

 beds, on fossil evidence, to the Wenlock shale {antea, vol. i. p. 21). 



2. €^n the Occurrence of Caradoc Sandstone at Great Barr, 

 South Staffordshire. By J. Beete Jukes, Esq., M.A., 

 F.R.S., F.G.S. 



Shortly after the publication of my memoir on the Geology of the 

 South Staffordshire coal-field in the ' Records of the School of Mines' 

 (vol. i. part 2), I received a note from Mr. Daniel Sharpe calling my 

 attention to the occurrence of Caradoc sandstone at a spot on the 

 eastern border of the Walsall Silurian district. Being in the district 

 for a short time in March last, I visited the spot indicated by Mr. 

 Sharpe, and found to my surprise a quarry I had previously over- 

 looked. It is a very old quarry, much overgrown by bushes and 

 brambles, and in a field which was, I believe, covered by standing 

 corn when I surveyed the district in 1849. From these circum- 

 stances, although I had passed within a few yards of it, it escaped 

 my notice. 



On visiting it this year, I was accompanied by Mr. George Eglin- 

 ton, the occupier of the ground, who was aware of the peculiar cha- 

 racter of the sandstone, and who also guided me to another very 

 remarkable little section, near Hay Head, which had escaped my 

 previous observation from the same circumstance of being overgrown 

 by bushes, which in the summer would render it invisible. 



The first-named locality is a little south of the sixth milestone on 

 the Birmingham and "Walsall road, in the fourth field S.S.E. of 

 Shustoke Lodge. The old quarry is just below the summit of a 



