ASSOCIATEB ROCKS OF THE BREIDDEN HILLS. 



537 



Hall Mill, 



Brook. 



Eoad. 1 



Pentamerus-beds in Shropshire, and they are the probable equivalent 

 of the Tarannon shales of ^orth Wales. 



The Wenloek shales follow, and they are of importance from their 

 position as showing a transition from the calcareous development in 

 Salop to the arenaceous type in Denbigh. They are admirably dis- 

 played in road- and railway-cuttings, small quarries, and a number 

 of transverse streams which flow down from the Long Mountain. I 

 have not yet been able to work out these rocks in great detail, 

 still less to follow the zones to the S.E. side of the synclinal, but 

 I hope at some future time to 

 return to this, the abundance of 

 Graptoliies giving promise of use- 

 ful results. 



I have run four sections across O 

 these beds from N.W. to S.E., rl 

 between the ]N'. of the area and ^ 

 Buttington, and they show a pretty ^ 

 regular succession and palaeonto- "^. 

 logical development, such as en- .S 

 ables us to compare them vrith ^ 

 other areas. ^ 



Beginning at the N. (fig. 2), a ^ 



number of sections are laid open ^ 



along the brook running from Har- _^. 



grave Wood to Middletown. At the g 

 • • • 1. 



junction of this with a tributary ;^ 



flowing past the schoolhouse, the ^^ 



lowest beds of concretionary, grey, -S 



calcareous shale (a) contain a few '^^ 



undeterminable shells, and dip <2> 



S. 15° E. at 32°. A little further ^ 



up, where the brook crosses the "-^ 



railwaj^, are similar shales (b) with ^ 



concretions (2 feet across) dipping | 



10° S. 10° E., and containing the | 



following Graptolites, which, to- ^ 



gether with others shortly to be § 



mentioned, have been kindly de- -^ 



ter mined by Prof. Lap worth : — ? 



Brook.- 



Quarry.- 



Eoad. 



Eailwav. 



Brook. 



Cyrtograptus, sp. 

 Monograptus priodon, var. 

 Flemingii, Salt. 



These are Lower Wenloek 

 forms. Further up, where a 

 branch from Winnington Green 

 enters, in a smaU quarry, are 

 finer bedded shales (c) which dip 

 S. 60° E. at 56°, and contain- 



so 

 I 



Tributary. 



Lane. 



