Correspondence — G. E. Dibley. 525 



to two feet in heiglit. Where the shore presented miniature cliffs 

 of clay capped by turf, the soil was turned over by the ice as by 

 a ploughshare. Along the greater part of the shore - line, but 

 especially where the shore was steep or rocky, the pressure forced 

 the ice up into hummocky fragments. Great cracks, the edges of 

 which were similarly thrown into hummocks, extended right across 

 the lake at two points between Bowness and Ambleside. When the 

 thaw set in and the ice contracted, the position of these two loci 

 of compression was marked by wide lanes of open water, while the 

 ice on either side was still strong enough to bear the weight of 

 a man. Other more local evidences of compression were seen in 

 funnel-like depressions in the ice, in some cases with a dangerous 

 hole in the centre, though the ice surrounding the hole was so 

 strong that a man was able without risk to reach the hat of a skater 

 who had fallen through. Evidences of the motion of the ice in 

 the direction of the greatest pressure was also to be seen in bent 

 and broken piles and landing-stages. These phenomena were not 

 to be seen where from any cause the ice did not attain to any great 

 tiiickness, as, for instance, at the mouth of Troutbeck, where the 

 flow of the river checked the formation of the ice. 



Scarcely less remarkable than the effects of the ice-action them- 

 selves was the short time that it took for denudation to remove 

 all traces of them. 



These are the facts that I observed ; and I think they may be 

 worth putting on record, especially because the opportunities of 

 observing them are so rare, Windermere being seldom frozen over 

 more than three or four times in a century. Geo. Crewdson. 



St. Mary's Vicarage, Windermere. 

 September Ist, 1904. 



THE DISCOVERY OF MAESUPITES IN THE CHALK OF THE 

 CROYDON AREA. 



SiK, — Some few weeks ago I received a letter from Messrs. 

 Wright & Polkinghorne (of the Battersea Field Club and Geologists' 

 Association) to the effect that while cycling from Purley to Beddington 

 they observed some chalk that had been thrown out while laying 

 the sewer in one of the new roads at the top of Russell Hill. 



Upon examining the chalk they were rewarded by finding plates 

 of Marsupites. The following Thursday evening I accompanied 

 Mr. Wright to the spot, when we found that the chalk had been 

 put back ; however, after a diligent search among the blocks on 

 the surface, we succeeded in obtaining fi.ve or six plates, two of 

 which were embedded in flint nodules. 



The nipple-headed form of Bourgneticrinus and the pyramidated 

 form of Echinocorys vulgaris, both characteristic fossils of the 

 Marsupite zone, were also obtained. 



The chalk is of a very soft nature, quite different to that of the 

 other zones in the district. I spent four hours the following Saturday 

 at excavations at a lower horizon in the hope of finding Uintacrinns, 

 but without success. I am bound to admit that the appearance of 



