SALTER AND AVELINE ON THE GARADOC SANDSTONE. 65 



shown at Corston on the extreme southern point of the district, 

 where they consist of pebhly grits interstratified with finer sand- 

 stones and occasional shales, full of fossils. They extend by Hope- 

 say Common to Plorderley, where they are less gritty, and become 

 so calcareous as to form a good building-stone. They are then 

 interrupted for awhile by faults and the trappean ridges of Hope 

 Bowdler and Ragleth ; and they reappear as coarse grits in the Hoar 

 Edge, where they are quarried, dipping east from the Lawley Hill at 

 an angle of 50° to 70° ; from whence they are continued by Frodesly 

 Park and Ruckley to Acton-Burnell Park and Harnage Grange, with 

 a limestone band continuous along their lower portion. The strike 

 turns here towards the east, and they are soon overlapped by the 

 coarse grits (6.) at Kinley. Fossils are very numerous in some por- 

 tions. The following are the species hitherto observed : — 



Calyraene Blumenbachii, *. 



Trinucleus concentricus, **. 



Phacops apiculatus, **. In the shaly beds. 



Homalonotus rudis, *. A rare Bala species ! 



Beyrichia complicata, ***. In the shales. 



Orbicula punctata. 



Orthis elegantula, 



Actoniae. 



flabellulum, ****. 



vespertilio, ***. 



testudinaria, *. 



calligramma. 



Strophomena expansa. 

 concentrica, Portl. **. 



spiriferoides, M'Coy. 



Rhynconella, two or three species. 

 Stenopora fibrosa, *****. 

 Retepora, n. sp. 



3. Thick-bedded JIaffs or freestones of Sibdon, Longlane, and Hor- 

 derley. — These consist of fine-grained freestones, greenish olive and 

 yellowish brown, much streaked with purple, and usually thick-bedded, 

 with calcareous partings full of fossils. They dip at moderate 

 angles, except along a line of disturbance which extends from Rag- 

 letli Hill southwards to Sibdon. On this line their lower beds are 

 much disturbed, and in some places quite perpendicular. North of 

 the trappean hills of Hope Bowdler, along the ridge of Enchmarsh 

 and Chatwall, these flags, somewhat • diminished in thickness, dip at 

 angles from 50° to 60° ; at Broome and further north they lie at a 

 lower angle, 30° to 40°, until they reach Church Preen, where they are 

 covered unconformably by the grits No. 6. At Chatwall and Ench- 

 marsh pebbles of quartz occur in the freestones, and there are beds 

 of yellow sandstone rendered in parts highly calcareous by abundance 

 of the Orthis alternata. Sow. (one of the characteristic fossils at 

 Bala) . The lower portion of these flags passes through thinner beds 

 into arenaceous shales which overlie the Hoar Edge grits last de- 

 scribed (No. 2). Their upper layers graduate into the thin-bedded 

 flagstones of the next division. 



VOL, X. — PART I. F 



