s T OF THE ORDOVICIAN AND >SE OF OTHER AREAS 



North-Eastern 

 Montgomeryshire. 



District. 



kilt 

 >eds. 



lock 

 ales & 

 estone. 



Zones of 

 f4. M. leintwardinensis 

 J 3. M. scanicus. 

 j 2. M. nilssoni. 

 [\. M. vulgaris. 



f4. Cyrtogr. lundgreni. 

 j 3. C. rigidus. 

 j 2. C. linnarssoni. 

 [J\.. M. riccartonensis. 



ttington Shales. 



ddiau Mudstones. 



pis-Castle Conglomerate 



and 

 limestones. 



iconfovraity.) 



f Black shales. 



rern-y -brain 



Group. 



^Limestone. 



f Limestone and ashy 

 grits. 



lerfawr 



jrl'OUp. 



(^ Grits and iiags 

 l-y-glo Group. 



ohite- Dingle Shales. 



ts. 



gs. 



IS. 



[To face p. 446. 



Southern Scotland 

 (Girvan Area). 



Mudstones and shales of 

 Lanark. 



Straiton and Bargany 

 Beds. 



Parkhill Group. 



Canregan Group. 

 Saugh Hill Group. 

 Mullock Hill Group. 



Beds ? 



es. 



lus 

 .tone. 



Drummuck Beds (with 

 Staurocephalus). 



pplethwaite Shallock Flags. 

 Limestone. 



Whitehouse Beds, 

 onglomerate. 

 le-End Beds., Ardwell Flags. 



Balclatchie Beds. 



f Grits and 

 •{ sandstone. 



I si 



Shales. 



