Vol. 67.] SALOPIAN ROCKS OP CAUTLEY AND RAVENSTONPDAXE. 221 



M.flemingii var. y, C. lundgreni, and M. dubius are all contained 



in these highest beds. 



Apart from the three gills mentioned previously, numerous small 

 streams which run from Bluecaster into the Bawthey are, with a 

 few exceptions, nameless. We have, therefore, for the sake of 

 convenience, named them alphabetically (see map, PL XII). 



One or more of the Wenlock zones crop out in each of these 

 gills, and, as the results of our work in them are summarized in 

 Table II (p. 222), it is only necessary here to mention a few points 

 of interest. 



(iv) West Gill. 



This gill, which flows into the Eawthey below Low Haygarth, 

 is of importance, not only because three of the zones are exposed 

 in its banks, but on account of the conformable succession into 

 the Browgill Beds which can be traced in the southern branch of 

 the gill. Gyrtograptus murchisoni occurs in the bed of the gill 

 20 yards below a cowshed; at the same distance above the shed the 

 Browgill Beds crop out. 



The lliccartonensis Zone (C.,) comes on 6 yards below C. murchi- 

 soni. Its beds are almost black, veined with calcite, and speckled 

 with cubes of pyrite ; their dip is 5° west of north-west at 55°. 

 The lower part of West Gill is laigely occupied by two felsite- 

 dykes, the lower of which is continuous with the ' old road dyke ' of 

 Near, Middle, and Far Gills. 



Exactly 52 yards from the Sedbergh road, and just below a 

 small lamprophyre-dyke, the rocks dip at 21° north by west, and 

 yield the fauna of the C.-lundgreni Zone (C 4 ). 



The only other exposures that show the succession from the 

 Browgill into the Wenlock Beds occur — 



(1) In a small drv valley running westwards in continuation of the head 



of Gill H : and 



(2) 20 yards below Ecker Seeker Bridge. 



Both these sections show the marked lithological and fauna! 

 changes which take place between the beds. 



In Ecker Seeker Beck the Oyrtograptus-murchisoni and Mono- 

 qraptiis-rkcartonensis Zones occur, but the Cyrtograptus-rigidus 

 Zone seems to be cut out by faulting. At the hedge on the right 

 bank of the beck there is evidence of faulting ; the dip of the 

 beds changes suddenly from 35° to 75° ncrth-north-westwards, and 

 there is considerable local development of secondary calcite in 

 ramifying threads and veins. Some yards lower down the rock 

 becomes concretionary, and Monograptus Jleminr/ii var. c occurs. 

 The presence of another fault at the mouth of the beck is proved 

 by a fault-breccia seen in the left bank, accompanied by large veins 

 and bands of calcite. 



