CiRC. 118. 



Carriages should be vacated at Hoff Mill, Hoff Lumb, a beautiful pool hard 

 by on the Wharfe, is well worth a visit if there is time. The rapids above it run 

 through a gorge which marks the place where the Wharfe enters the Millstone Grits. 

 The escarpment to the north-west runs up to the top of Burnsall Moor, and in the 

 other direction trends to the north-east above' Skyreholme Beck. In the fork 

 between, the Carboniferous Limestone rises above Appletreewick, and much of it 

 assumes the form of knoll-reefs. Returning from Hoff" Lumb by the mill, the road 

 to Appletreewick may be left by a foothpath to the right, a little above the chapel. 

 Along the path a good view of the gravel mounds may be had and a section, where 

 the brook has washed against them, may be seen. A small natural hollow, called 

 on tlie 6-inch map Balker's Dub, shows the irregular nature of the deposits and 

 points to the probability of their accumulation under glacial conditions. The route 

 continues by Skyreholme Mil] and Middle Skyreholme up the left branch of the 

 stream. The Grit escarpment is here crossed again by another gorge, and after a 

 short interval, which represents the BoUand shale, here not visible, we come to the 

 Carboniferous Limestone dipping southerly at Skyreholme Dam. The Limestone 

 forms ah anticline, of which the stream gives a section In its course. The beds 

 eventually turn over again to the north-west, and the Shales and Millstone Grit of 

 Fancarl Crag come on again before reaching the Craven fault, a down-throw on 

 the south which brings the said Grit crag against beds low down in the Carboni- 

 ferous Limestone. At the top of Skyreholme Dam two valleys unite, the left-hand 

 one takes us past the entrance to a lead mine, 'Head Vein ;' some yards due north 

 of this is a swallow hole in the upper part of the Limestone, called Hell Hole. 

 'Facilis decensus' for some little way, but further, candles, a rope, and mackintoshes 

 may !)e useful. I am not aware that it has been fully explored. 



The survivors have three courses open to them. They may rejoin the gill to 

 the right, which is Troller's Gill, and from which we have made a digression. The 

 hillside, east of this, shows a well ice-worn surface, with scattered bovilders lying on it. 

 A stroll up the valley takes us past an old dam where an interesting section may l.)e 

 seen. Crinoidal Limestone, 8 feet, blue slate, 20 feet, resting on calcareous mud- 

 stone with corals. Higher up are more lead mines and at the Grouse Inn to the 

 north-east on the road to Pateley Bridge a guide may be obtained for the famous 



Stump Cross Cavern. 



Another route takes in from Hell Hole to the left of Fancarl Crag by a rough 

 road. When this meets the road from Grassington to Greenhow, a gate in the wall 

 opposite leads across the moor to Grimwith Reservoir. Some of the walls in the 

 fields below this moorland road are built of limestone conglomerate. The quarry 

 whence these were got is now covered up but similar rock may be occasionally seen 

 in the brook below when the stream is low. 



BOTANY. — There appears to be no available information relating especially 

 to the area set apart for investigation. 



VERTEBRATE ZOOLOGY. 



fauna of the Gill. 



The same remarks apply to the vertebrate 





\ 



\ 



CONCHOLOGY.— Conchologically the romantic and highly picturesque 

 gorge of Troller's Gill is a rich hunting ground : the limestone crags and scars of 

 the gorge itself yield such species as A::et'a tridens^ Helix lapicida^ Clansilia 

 craveiicnsis^ and all the usual calcareous and woodland moUusca. There are also a 

 mill-dam above, where Liviax hcvis occurs plentifully, and another, the Skyreholme 

 mill-dam, below, in wdiich Limncca peregj-a may possibly be found to vary with its 

 environment ; and Ancyliis Jluviatilis is in profusion in the connecting stream. 



ENTOMOLOGY.— The insects of the Gill are so far unknown, and the 

 place would probably repay close and systematic investigation. 



4- o p.m. 

 4-30 p.m 



4-45 P-m. 

 5-15 p.m, 



6-45 p.m. 



PROGRAMME OF MEETINGS.— 



■ 



—Meat Tea, 2/- each \ 



—Sectional Meetings > All at the New Inn, Appletreewick. 



—General Meeting ) 



—Conveyances leave New Inn for the station. 



-Departure of train from Bolton Abbey Station for Leeds, etc. 



i 





