p. F. Kendall— On " Slickensides." 551 



The continuity of tlae anticlinal with that of Dean Hill remains to 

 be proved. The axis probably runs somewhat obliquely towards the 

 south-eastern corner of Dean Hill. Evidence of its existence may 

 be looked for on the west side of the Test valley and in the neigh- 

 bourhood of Romsey Common. 



Another anticlinal, about eight miles north of this one and parallel 

 to it, passes under Winchester, bringing up the lower beds of the 

 Chalk on which the city stands, in the valley of the Itchen ; also 

 the Upper Greensand at East Meon, and some of the lower beds 

 of the Chalk in the Test Valley, near Stockbridge. This may be 

 readily seen on the map of Chalk zones published by Dr. Barrels. In 

 much the same way it appears that the more southerly fold brings 

 up the London Clay in the Itchen and Test Valleys, and the Chalk 

 of Portsdown eastwards. 



Apart from the theoretical intei*est which attaches to this matter, 

 it is of some pi'actical importance that the London Clay formation 

 should be accurately and fully mapped, as it is the chief brickearth 

 stratum of the area. Also that the existence of this anticlinal should 

 be recorded on the map, as it must considerably affect the circula- 

 tion of water in the Chalk beneath the Tertiaries, and thereby 

 render deep borings in some spots comparatively useless. 



Errors in detail have also been detected in the mapping of other 

 parts of the basin, the particulars of which do not come within the 

 scope of this paper. 



A movement is on foot in Hampshire, started by Mr. Shore, to 

 induce the Government to resurvey the county geologically on the 

 Ordnance Maps of the six-inch scale. This has been done for 

 several northern and midland counties, and also for part of the 

 eastern border of Hampshire ; but, as at present resolved, it is not 

 intended to survey the whole county on this scale, or to revise the 

 present map. The drift beds of the Hampshire basin are now being 

 surveyed, and a re-survey of the whole area, and correction of such 

 errors as have been detected, could be carried on to a great extent 

 pari passu with this work, without any considerable additional 

 expense. 



The Council of the Hartley Institution and the Town Council of 

 Southampton have taken up the matter, and are now inviting the 

 co-operation of all the Town Councils in Hampshire and the Isle of 

 Wight, and of all persons interested in geological science, to assist in 

 memorializing the Government to carry out this work. 



VI. — On Slickensides and the Origin of some Makl-Bands m 



THE Chalk. 

 By Percy F. Kendall. 

 rriHE phenomenon of " Slickensides " is considered to occur only 

 I in connexion with faulting, and it has frequently happened 

 that another name has been conferred upon it when not accompanied 

 by signs of fracture; but some recent observations have led me to 

 doubt the propriety of making such a distinction. 



