122 



SILURIAN GKOUP. 



2. Wenlock and 

 Dudley Formation. 



d. Wenlock and 

 Dudley limestone. 



e. Wenlock and 

 Dudley shale. 



d. Highly concre- 

 tionary grey and blue 

 subcrystalline lime- 

 stone. 



e. Argillaceons shale, 

 liver and dark grey- 

 coloured, rarely mica- 

 ceous, with nodules of 

 earthy limestone. 



3. Caradoc 

 Formation. 



Flags. 



g. Sandstones, grits, 

 and limestones. 



/. Thin-bedded, im- 

 pure, shelly limestone, 

 and finely laminated, 

 slightly micaceous, 

 greenish sandstone. 

 ^g. Thick-bedded, red, 

 purple, green, and 

 white free-stones. Con- 

 glomeritic quartzose 

 grits. Sandy and 

 gritty limestones. 



4. Builth andLIan- 

 deilo Formation. 



h, Llandeilo flags. 



h. Dark-coloured 

 flags, mostly calca. , 

 reous, with some 

 sandstone and schist. 



LOCALITIES FOR FOSSILS, &c. 



Ladle w Castle, 'WTiitcliffe, Munskw, Diddlebury, Lardeu, Shrop- 

 shire ; Croft Castle, Mortimer's Cross, Titley, Kington, Fown- 

 hope. Stoke Edith, Herefordshire ; West flanks of Malvern and 

 Abberley Hills, Worcestershire ; West flank of May Hill, Tort- 

 worth, Gloucestershire; Presteigne, Pain's Castle, Radnorshire; 

 Treweme Hills, Corn-y-fan, Brecon, Llanbadock near Usk. 



Aymestry, Croft Ambry, Gatley, Brindgwood Chase, Downton-on 



