ON THE STOCKDALE SHALES. 



695 



A little above the Atrypa-fleocuosa band a thin bed occurs in the 

 Dimorphogi'ajDtus-Bhales, with small Brachiopods and Turrilepas, as 

 at Skelgill. 



Ab 1. The shales of the Jimhriatus-zone are seen on the line of 

 our section at the base of the left bank of the stream ; they contain 



Fig. 9. — Section across " Cliff" Appletreeworth BecTc. 

 (Scale 12 feet to 1 inch.) 



Ac 4 



Ac 3 



Ac 2 



Ashgill Shales, 



Monograptus fimhriatus, Nich., Petalograptus ovato-elongatus, Kurck, 

 Rastrites peregrinus, &c. A subsidiary disturbance is seen above 

 them, removing the Encrinurus-punctatus zone, the argenteus-zone, 

 and part of the zone of Phacops glaher ; but about 10 feet of the 

 latter remains with its nodular bands. 



Ab 5. The convolutus -beds are seen, but the exposure is not a very 

 good one. We obtained Monograptus convolutus, His., Bastrites 

 hybridus, Lapw., Biplograptus tamariscus, Nich., &c. A gap occurs 

 here with no rock visible. 



Ac 1. The next rock above this gap belongs to the CUngmii-hsind, 

 a few inches of shale occurring with MonograpAus Clingani, Carr., 

 &G. 



Ac 2. The aloniensis-zone consists of blue mudstones about 2 feet 

 6 inches thick. 



Ac 3. The spinigerus-zone consists of many-coloured shales 2 feet 

 6 inches thick, with abundance of Monograptus spinigerus, Nich., 



