Lees: We the rby Re-visited by Yorkshire Naturalists. 327 



also thin layers of marl intercalated. The most interesting- 

 feature was the wide, irregular joints exposed. Most of these 

 do not extend to the surface, and some of them would average 

 a foot in width. Their mode of formation gave rise to dis- 

 cussion, being- variously attributed to contraction, slipping of 

 the beds, and the action of water. Similar joints running to the 

 surface have been filled with sandy material. The limestone 

 contains a large number of irregularly-shaped cavities, lined 

 with crystals.' This is Mr. Hawkesworth's account. 



According to the route sketched out in the circular by Mr. 

 A. R. Dwerryhouse, the party should have proceeded by train 

 to Thorp Arch to examine the gorge of the Wharfe between 

 there and Wetherby, but, after examining the railway sections, 

 it was too late for the train, and the heat was too excessive to 

 admit of walking, so the geologists joined the botanists, and 

 ,had a quiet stroll through Linton, on the banks of the Wharfe, 

 to Wetherby. 



Mr. Arthur R. Dwerryhouse, B.Sc, F.G.S., wrote that good 

 sections of the Lower Magnesian limestone are to be seen in 

 the gorge of the river at Falcon Cliffs (?), where there are good 

 examples of contortions produced by irregular solution of the 

 limestone. Under favourable conditions the Middle Marls may 

 be seen nearer to Wetherby, but in the case of clear sections 

 not being- available their position is indicated by a widening of 

 the gorge. This gorge is one of a series which were produced 

 during the Glacial Period by the deflection of the pre-glacial 

 streams by the Vale of York Glacier. The pre-glacial river 

 passed out into the Vale of York over the site of the town of 

 Wetherby, deep excavations for sewerage purposes having been 

 made in the town without touching the bed-rock. 



During the whole day there were but two bands abroad. 

 One, alighting at Wetherby, first visited the new railway works, 

 which is to give a shorter route to Harrogate from the Thorner 

 line, and then proceeded to Linton bridge and back to the 

 Gasthaus — an 'Angel' in this case by the winding bank of 

 Wharfe, here brimming and somewhat sullen of flow, even 

 after long weeks of rainless sky. 



Those members of the party who alighted at Collingham 

 worked their way towards Wetherby along the Collingham bank 

 of the Wharfe, and after passing Wetherby went a short way 

 along the north bank towards Flint Mill. 



Mr. Rile}- Fortune, F. Z.S., reported that the members of the 

 Vertebrate Section were at this meeting chiefly conspicuous by 



1901 November i. 



