Correspondence — Dr. J. E. Taylor — Rev. J. M. Me lb. 383 



ridges, which are parallel to one another and to the direction of the 

 principal valley of the district." 



Similar mounds are equally common in many parts of the York- 

 shire dales : they occur, for instance, in Bishopsdale, Wensleydale, 

 and Ribblesdale, and on the Haws between the latter dale and 

 Wharfdale. In Westmorland, too, such mounds are common at the 

 foot of the mountains, and they form a striking feature in the 

 landscape of the low ground near Kendal. J. R. Dakyns. 



Bridlington Quay. 



FAULTS IN THE LONDON CLAY, NEAR HARWICH. 



Sir, — The extensive excavations now going on at Ray Island, near 

 Harwich, where the new docks are being constructed for the Great 

 Eastern Railway Company, have exposed some splendid banded sections 

 of the London Clay. One of these is plainly visible to the railway 

 travellei', on the left-hand side, about a mile before he reaches Dover- 

 court Station. As nearly the whole of the humpy mass of land now 

 called Ray Island is intended to be carried into the neighbouring 

 estuary of the Stour for the erection of embankments, a notice of the 

 dislocations now visible in the sections is of geological value. 



In many places the London Clay is seen to be thrown into a series of 

 very gentle folds. At no fewer than nine places in the section, small 

 faults are as plainly visible as in a geological diagram, owing to the 

 banded character of the strata. With one exception all the faults have 

 an angle of about fifty degrees, the exceptional fault (seen in the 

 railway cutting) being nearly vertical. The latter shows a dislocation 

 of about two feet. The largest fault is visible in that end of the rail- 

 way cutting nearest to Dovercourt, and measures upwards of twelve 

 feet. A fault of more than eight feet is seen in a section near the 

 estuary, and some of the minor dislocations occur at intervals of from 

 fifty to one hundred yards. The line of fault is in most instances as 

 sharply defined as if the strata had been diagonally cut through with a 

 knife. J. E. Tatlok. 



. PYRITIFEROUS SAND FROM LAKE WINNIPEG. 



Sir, — I have had a sample of somewhat curious sand put in' my 

 hands by a man who has recently returned from America, and venture 

 to think it may elicit some further information about it could you find 

 space for my note. I send a sample of the sand; you will see that it 

 consists of a very fine grained siliceous sand, grey in colour, the grey- 

 ness being due to an innumerable quantity of almost microscopic 

 concretions of pyrites. Under the microscope these are pretty objects, 

 mostly globular, and when broken show very distinctly their concentric 

 structure ; they appear very similar on a minute scale to the concretions 

 so commonly met with in the Cretaceous deposits, etc. Possibly they 

 have formed round a foraminiferous or other organic nucleus, but I 

 have not succeeded in detecting it as yet in any of the broken globules. 



The locality from which the sand was brought is said to be on the 



