Vol. 67.] THE SALOPIAN OF CAUTLEY AND UAVENSIONEDALE. 223 



The River Rawthey. 



The part of the Rawthey under consideration lies between the 

 mouth of Wandale Beck and Cock's Dub. The Wenlock zones exposed 

 on the western slope of Bluecaster should in turn appear in the 

 banks of the llawthey ; but, as the result of faulting, the succession 

 of zones is irregular. 



Above Handley's Bridge the three lowest zones strike across the 

 Rawthey in a south-easterly direction, but they are cut off at the 

 bridge by a fault trending north-west and south-east. 



Both the Oyrtograptus-murchisoni (C T ) and Monograptus-ricearto- 

 nensis Zones (C.,) near the mouth of Wandale Beck have yielded 

 the characteristic graptolites enumerated in Table I (p. 222). 



The zone of Gyrtograptus rigidus (C 3 ) which conformably succeeds 

 them down stream yields few fossil remains ; and those which do 

 occur, Jlonograptus Jiexili.s and M. flemingii var. a, are poorly 

 preserved, owing to movement in the rock close to Handley's 

 Bridge, where there is evidence of both folding and faulting on a 

 considerable scale. At Handley's Bridge the beds change their 

 dips from south-south-west to west by north, and they are seen 

 to strike across the river, and then to bend round towards the right 

 bank. 



Although exposures are good below Handley's Bridge, there is 

 a scarcity of palaeontological evidence ; two zones only are found. 

 The Cyrtograptus-lundgreni Zone (C t ) extends from Handley's 

 Bridge to Cautley Thwaite, with the exception of some yards below 

 the mouth of Backside Beck, and is conformably succeeded by 

 the zone of 0. rigidus (C 3 ). Below the fault at Low Wardses the 

 C.-lundgreni Zone (C 4 ) again appears. 



The general dip of the rocks throughout is in a north-north- 

 westerly direction, although variations occur in different parts of 

 the river where it is crossed by faults, as, for example, at the 

 mouth of Backside Beck, where the dip changes to south-west by 

 south, and above High Wardses Bridge, where it is 50° east of 

 north. 



The evidence for the establishment of the succession lies below 

 the mouth of Backside Beck. The beds dipping 22 D west-north- 

 westwards are yellowish and sandy when fresh, and yield Phaeops 

 obtusicaudatus in abundance. It will be shown elsewhere that 

 beds containing that trilobite are immediately overlain by the 

 lowest Ludlow, Zone of Jfonograptus nilssoni (DJ ; hence in this 

 part we have the completion of the Wenlock succession. 



The four Wenlock zones are exposed in the Bluecaster Gills, 

 and are conformably overlain by the Phacops-obtusicaudatus Bed 

 as seen in the Rawthey. 



(b) Wandale Hill. 



The Wenlock and Ludlow rocks form the greater part of the top 

 and the eastern slope of Wandale Hill. These beds are limited on 

 the west by the Wandale-Hill fault, which runs in a north-north- 



Q. .T G. S. No. 266. q 



