HUGHES : INGLEBOROUGH. 
51 
variations and differences of the same kind, between the 
several sections in the southern district itself, as there is between 
the section from the south and that from the north side of Ingle- 
borough which we are comparing. The Graptolitic Mudstone 
or Stockdale Shale is hardly recognisable in the Austwick section, 
DIAGRAM IX ILLUSTRATION OF EXPLANATION OFFERED OF SECTION AT 
WATERFALL BY WHARFE MILL DAM. 
Fig. 2, but the black shale seen close above the conglomerate is 
very Hke that seen in the same position in many of the sections 
on the north side of Ingleborough. A Umestone is seen in the 
Austwick section at the base of the Pale Slates, and a fault 
explains why the main mass of the Stockdale Shale is lost sight 
of under the hmestone on the downthrow side. 
The Fairy Gill Shale is just seen in the centre of the anticUnal 
arch ; the main mass being folded, and thrown down out of sight, 
between the two faults indicated in the section. This view is 
confirmed by the occurrence of Strophomena siluriana Dav., 
Orthis testudinaria Dalm., and other Fairy Gill fossils in the black 
shale under the conglomerate, and of Monograptus crenularis 
Lapw. above it. These faults and folds and changes of dip are 
oblique to the strike of the beds, and therefore it is impossible 
to indicate with precision in one section, the manner in which 
the absence of beds, which are of great thickness on the other 
