Vol. 55.] CONfiLOltERATES OP THE LOWER SEVERlJiT BASIN". 119 



black, or red). — The hornstones occur generally in the Middle 

 Permian conglomerates and coriistones, in greater or less quantity, 

 as very small chips and pebbles. They are abundant in the 

 Clent Hills district and common in the Warshill area, while 

 they seldom occur in these conglomerates in the other districts 

 described. 



Grey and purple-banded felspathic grits are common 

 in the cornstones of the Clent Hills district, and in the conglo- 

 merates of the Warshill area, but seldom occur in the conglomerates 

 of the other districts. 



Coarse and fine volcanic tuffs and agglomerates are 

 very rarely found in these conglomerates in any of the districts 

 described, except Clent Hills and Warshill. 



These Archgean fragments embedded in the Middle Permian cal- 

 careous zones constitute in the Clent Hills district the bulk of the 

 material, in the Warshill district 40 per cent., and in the remaining 

 areas rarely more than 5 per cent. 



The hornstones, grits, tuffs, and agglomerates can be paralleled 

 more or less certainly with similar Archaean or Uriconian rock- 

 types, which occur in place as rock-masses at Barnt Green, the Lower 

 Lickey Hills, and jN'uneaton on the south and east, and at the 

 Wrekin and Cardington Hills of Shropshire on the north and 

 west. 



Yein-quartz pebbles commonly occur in the Middle Permian 

 cornstones of the Clent Hills district, and are also found in small 

 quantities in the same conglomerates in other districts. 



Conglomerates of doubtful age, in the form of pebbles, have 

 been rarely found in these Middle Permian conglomerates. These 

 conglomerate-pebbles are hard and compact, and chiefly made up 

 of vein-quartz and pyroclastic rocks. 



(2) Cambria]^. — Rounded pebbles of greyish-white quartzite are 

 fairly abundant in the Clent Hills district, but are not common in the 

 other districts. These quartzites are comparable with the Cambrian 

 quartzites which occur in place as rock-masses at Xuneaton and the 

 Lower Lickey on the south-east, and at the Wrekin on the north- 

 west. 



(3) Ordoyician pebbles have not been found hitherto in these 

 Permian conglomerates. 



(4) Llajtdoyert San^dstones. — I have found, in Band C^ of the 

 Bowhills district, a piece of fossiliferous brown sandstone containing 

 Rhynchonella nucula, Rh. defiexa^ and MytiJus mytilimeris. This 

 sandstone is chiefly made up of washings from white quartzite. 

 Another yellow and fossiliferous piece of sandstone from the same 

 band and locality is also made up of washings from quartzite and 

 quartz, and contains Mytilus 7nytilimeris. Apiece from the top part 

 of Band B\ at Enville, is a brown, micaceous, fossiliferous sandstone 

 containing Tentaculites annulatus. Several unfossiliferous fragments 

 of the foregoing lithological types have been found in Band C^ of the 

 Enville district. Llandovery sandstones are, however, extremely 



