Field Notes. 



245 



been formed during- an early prolongation of the Vale of York 

 glacier. But this does not explain the great height, 730 feet, or 

 the marked absence of drift in the neighbourhood. It is rather 

 suggestive, however, that drift is found even still higher in the 

 Derwent Valley, in Derbyshire, near Crich, and though it is 

 very certain that there was no connection between the two ice 

 streams, and also that the moorland and valleys between are 

 quite driftless, yet the similarity in that both reach abnormal 

 heights may be due to the same cause. It would be interesting" 

 to know where the Scandinavian, Vale of York, and Derbyshire 

 ice streams met. For a time, and until they coalesced, there 

 must have been a piling up of the ice at the points where the 

 streams met, and the thickening indicated by the high level 

 drift might well have resulted from the meeting of such opposing- 

 streams. If so, then in this direction is to be found the solution 

 of the difficulty that confronts one both at Crosspool and Crich. 

 Of one thing we can well be certain ; everything that occurred 

 was the result of the working of natural laws familiar to us all. 

 Ice does not start climbing up hill sides unless it is pushed from 

 behind. The energy that carried the Crosspool erratics to the 

 spot where they were found was transmitted through the wind- 

 ing glacier from the lofty ice cap that fed it. All we need is 

 more data, and until that is obtained it will perhaps be better to 

 consider the Crosspool enigma as one of the unsolved problems 

 that must be kept in mind when we start theorising about the 

 glacial history of Yorkshire. 



BIRDS, 



Rare Birds Nesting near Filey. — In June I was fortunate 

 in finding the Stonechat, Teal, and Red-legged Partridge nest- 

 ing near Filey. Several pairs of the latter birds are now 

 established there. — R. Fortune, Harrogate. 



Large Guillemot Egg from Bempton. — At the excursion of 

 the International Ornithological Congress held at Bempton, on 

 2ist June, Mr. W. Wilkinson, one of the ' dimmers,' obtained a 

 double-yolked egg of the Guillemot. It is of the common 

 variety as regards colour, namely, the blue background with 

 black streaks and marks upon it ; Wilkinson considered it to be 

 one of the largest eggs obtained from the Bempton cliffs. It 

 measures 3^^^ inches in length, inches in width, and weighs 

 precisely 6 ozs. It was secured for the Hull Municipal Museum. 

 — -T. Sheppard, Hull. 



1905 Aug-ust I. 



