ON THE STOCKDALE SHALES. 705 



the beautiful little Gyrtograptus Grayce, Lapw., and the bed yielded 

 also Monogrcvptus pandiis, Lapw., and a specimen of Retiolites Geinitz- 

 ianus, Barr. The band is seen on the grass- and heath-covered left 

 bank, and is succeeded by sixteen feet of ordinary pale shales, after 

 which is a gap crossed by a footpath, in which there is room for 

 about ten feet of rock. 



We refer the beds between the uppermost M.-turriculatus band and 

 this point to the zone of Monograptus crispus. There is little doubt 

 that some of the beds are faulted out, either along the line of the 

 dyke or below it, or both, and the shales which are seen are so 

 baked that delicate forms like Monograptus crispus, if they originally 

 occurred there, would be obliterated. The other species found all 

 belong to the crispus-zone, and the zone is found in the immediate 

 vicinity of this gill. About forty-four feet of rock has been 

 measured belonging to this zone. 



At the same time we would refer to the grey gritty shale as the 

 Cyrtograptus- Grayce band, believing it to form the very uppermost 

 part of the crispus-zone. Above the footpath the section is less con- 

 tinuous. 



B6. We believe that the footpath marks the line of separation 

 between the Lower and Upper Browgill beds. 



Above the footpath are fourteen feet of green shales, passing up 

 into a great mass of red shales, with interstratified grits, which 

 become greenish grey towards the summit, the whole having a 

 thickness of about 160 feet. We have obtained no fossils from this 

 portion, which is quite similar to the Upper Browgill group as de- 

 veloped elsewhere. 



It will be seen that the Browgill Beds of this locality have a total 

 thickness little short of 300 feet, and for diversity of character 

 and richness of fossils they are unexcelled in any other part of the 

 district. 



River Rawthey, 



The following Graptolites from black shales interstratified with pale 

 green shales are preserved in the Woodwardian Museum ; they were 

 collected by Prof. Hughes at Eawthey Bridge and undoubtedly belong 

 to the crispus zone : — 



Monograptus exiguus, Nich. I Cyrtograptus spiralis, Gein. 

 pandus, Lapw. \ Petalograptus palmeus, Barr. 



The Browgill Beds are all well seen in Hebblethwaite Gill, on the 

 south side of the Eawthey valley, and nearer Sedbergh than the last 

 locality. 



Professor Hughes has obtained Monograptus turriculatus from this 

 stream, and we found bands with : — 



Monograptus pandus, Lapw. I Petalograptus palmeus, Barr. 



Cyrtograptus ? spiralis, Gein. \ Retiolites Geinitzianus, Barr. 



So that the two Graptolitic zones of the Browgill Beds appear to 

 be here present. 



