TRACES OF THE GREAT ICE ACE IN DERBYSHIRE. 25 



t)een led from a re-examination of the evidence to discard it. 

 That some amount of submergence took place is doubtless true, 

 but it cannot have been nearly so extensive as to convert the 

 ridge between the Goyt and Wye into a strait. 



Glacial deposits occur as high up the Wye Valley as Monsal 

 Dale. Thus on the lower slopes of Fin Cop, and in the walls 

 near Ashford, may be found numerous boulders of granite, slate, 

 millstone grit, Yoredale rock, quartzite, toadstone, and limestone. 

 These are unquestionably glacial, although I have seen no 

 boulders which can with certainty be said to be ice-scratched. A 

 similar collection of ice-carried boulders may be found on the 

 lower slopes of Highfields, some of them undoubtedly glaciated. 

 None are to be found on or near the summit. Near the railway 

 bridge, to the south of Monsal Dale station, the cutting shows a 

 deposit of boulder-clay, containing rounded limestone boulders. 

 On the hills, to the west of Bakewell, are to be found deposits 

 of boulder-clay, containing beautifully glaciated boulders of 

 granite, limestone, etc. ; while lower down the valley on the hills 

 behind Haddon Hall are to be found patches of boulder-clay, 

 containing glaciated boulders of granite, limestone, etc. A good 

 exposure is to be seen in the cutting near the north end of 

 Haddon Tunnel, containing numerous boulders. In laying out 

 the grounds of the Whitworth Institute at Darley Dale, similar 

 deposits were met with, containing glaciated boulders of many 

 rocks foreign to the district. Among others, was a portion of a 

 silicified tree trunk, which is now, I believe, to be seen in the 

 Museum of the Institute. I was informed by Mr. J. H. Dawson 

 that during the excavations an extensive, though thin, bed of peat 

 was cut through. From the contour of the district it seems not 

 improbable that a lake at one time occupied this portion of the 

 valley, the only outlet to which is the gorge in the limestone 

 escarpment at Matlock Bridge. This layer of peat supports this 

 view, and the matter is well worth careful investigation at the 

 hands of geologists resident in the county. 



Other deposits of boulder-clay occur on Riber Hill, on the 

 southern extremity of the Crich inlier of limestone, and still 



