648 ME. W. H. HARDAKEK ON A FOSSIL-BEARING HORIZON [DeC. I912, 



4. Soft flaggy sandstone, 2 feet. 



6. Breccia 6 feet thick, resting upon an uneven surface of No. 4. It is 

 false-bedded. The fragments are considerably larger than those of 

 Beds 1 or 3, and include many small blocks of fossiliferous Silurian 

 sandstone. 



6. Sandy marl, 3 feet. 



7. Conglomerate of large well-rounded pebbles, 5 feet. 



8. Sandstone without pebbles, 5 feet. 



9. Subangular breccia. Varying in thickness from 9 feet to 11 feet 



6 inches. (In the sti'ata numbered 5, 7, and 9, fragments of fossili- 

 ferous Silurian — probably Llandovery — sandstones occur. They 

 become more numerous as we pass from 5 to 9, while the proportion 

 of Carboniferous Limestone and chert diminishes. The fossiliferous 

 fragments of sandstone are accompanied by those of other sandstones 

 of a dark red colour and micaceous. A peculiar green quartzite, 

 Lower Permian sandstone, and vein-quartz also are common.) 



10. Sandstone without pebbles, 2 feet. 



11. Brecciated sandstone, 10 feet. The rock-fragments included are small. 



12. False-bedded sandstone, 2 feet. 



13. Brecciated sandstone, with coarse breccia near the top, 5 feet. 



D^. The Tower-Hill Sandstone Sub-group (22 feet).— 

 This sub-group consists of 22 feet of sandstones (in which pebbles 

 are rare), with two thin seams of marl. These rocks crop out at 

 the eastern end of the canal-cutting at Tower Hill, and are also 

 well exposed in Eocky Lane. 



Above this last division in the canal-cutting the Bunter Pebble- 

 Beds are found to succeed unconformabh*. In Rocky Lane the 

 Tower Hill Sub-group is also followed eastwards by Triassic pebble- 

 beds, but there is room for the suspicion that the usual unconformity 

 is here accompanied by a fault. 



The harder beds of the local ' Permian ' sub-grou])S described 

 above are marked by terraces, and the beds of marl met with in 

 the lower part of the sequence are marked by flatter tracts of 

 ground. 



The most distinct of the minor terraces is that produced by 

 the Eock-Parm Conglomerate. The rocks forming the Breccia 

 Sub-group, however, give rise to the most marked surface-features 

 of the series. They generally form relatively high ground ; and a 

 sudden rise of the surface indicates in each caso the approach to 

 their outcrop. This sudden change of slope is very noticeable in 

 'going eastwards along Rocky Lane near the Manor House, and at 

 the western end of the canal-cutting. 



