Notes and Comments. 5 



THE TRENT AEGER. 

 In a recent issue of ' Nature '* Mr. W. H. Wheeler gives a 

 detailed account of the Aeger in the Trent, which he had 

 witnessed. The aeger or bore ' is caused by the check of the 

 tidal flow through the shoal water of the sand banks and the 

 contraction of the waterway, the tidal current over-running the 

 transmission of the foot of the wave.' It first assumes a crest 

 somewhere between Burton Stather and Amcotts, depending on 

 the condition of the tide, the water rising almost simultaneously 

 3 feet. The bore was to be seen under exceptionally favourable 

 conditions on September 30th and October ist last. It could be 

 heard approaching about half a mile from the place of observa- 

 tion, and passed with a crest in the middle of the river of from 4 

 feet to 4^ feet, extending across the full width of the river, which 

 is here about 200 feet at high water. At the sides the breaking 

 waves rolled along the banks 6 feet or 7 feet high. The 

 crest was followed by five or six other waves of less height, 

 terminating in a mass of turbulent broken water for a distance 

 of 100 yards. The velocity of the wave, as nearly as it could be 

 measured, was about 15 miles an hour. 



GEOLOGY. 

 Red Rock of Rotherham. — Whilst out with the Geological 

 Students of the Sheffield University on October 7th, we were 

 fortunate enough to discover a fossiliferous band of clay in this, 

 otherwise barren, rock. The locality is a quarry, now disused, 

 almost opposite to the Kiveton Park Colliery's Hospital, on the 

 Kiveton Park to Harthill Road, about half a mile south of the 

 former village. Leaving the road by the truck-way the quarry 

 is soon reached, and the band is to be seen on the eastern face 

 of the rock about four feet from the base of the exposure. 

 It is about four or six inches in thickness, dipping in a 

 northerly direction ; about 12 feet of the band is to be seen, 

 the northern end being obscured by the talus. Its further exten- 

 sion northwards is very probable, for a few yards further on a 

 spring is seen, the presence of which could not well be accounted 

 for in any other way. The fossils found in the clay are mostly 

 fragmentary, but seem to be of the usual coal-measure type. 

 Up to the present they have not been identified with certainty. 

 — L. Glauert, Junr., F.G.S., Sheffield, Dec, 1905. 



* Vol. 73, No. 1880. 

 1906 January i. 



