the J^oniioT;^ and Hampshire Basins, :; 129 



greensand country-j , ?uid i-uns so l^ard up to the great centraj 

 fissure of the Weald, as to conspire with it in producing, and is 

 indeed, in this way, the cause of the exposure of the Weald clay 

 in Hartingcombe — that projection into the Wolmar Valley, west 

 of Hindhead and Blackdown, spoken of in the former part of 

 this memoir. The transverse fissures between Telegraph Hill or 

 Holder Hill, Stubs Hill and Vining Common, produce prolon- 

 gations of that exposure of the Weald clay quite down into the 

 synclinal line, and indeed almost int9 the anticlinal at Iping*^.| 



Although in its further progress westward the Greenhurst line 

 has still an elevation of its own in a saddle of sand-hills, through 

 Chithurst, Trotton and Rogate, it is very much incorporated in 

 its upheaving effect, and thus acts in conjunction with the central 

 anticlinal line ; or, in other words, its synclinal reduplication is 

 immediately lost in the superior heave of that line towards Has^ 

 lemere. And it is a curious fact, that the chalk, taking advantage, 

 as it were, of this aberration northward, losing the ordinary dip 

 of the South Down range, pushes its escarpment forward iuja 

 l^ypad high talus at South Harting. 



I„j From Rogate westward no satisfactory section can be obtained ; 

 and in its passage on the north side of the town of Petersfield, 

 little is seen of this line but a broken saddle of sand-hills till it 

 ^ikes the Malm Rock or upper greensand at Langrishf. ,.^| 

 IjjThe anticlinal disposition is to be seen in an imperfect section 

 c^j both sides of the East IVIeon road at Langrish ; and to an 

 unpractised observer it would seem insignificant, if the general 

 aspect of a broken chalk saddle in the country west of it had 

 not caused it to be sought for as a nucleus of elevation. 



Although trifling of itself, the sweep of the rocks north and 

 south away from this point marks its character ; and on prq^ 

 ceeding up the valley on the road to Winchester, a chalk -pit in 

 the gray chalk shows the northerly dip and westward strike of 



^:* I am not sure that there is not another and minor contortion of the 

 Weald group projected into this curious offset of the Weald-clay valleys 

 It shows itself in the river bank at Baybridge near Knepp Castle. I have 

 detected it again in the escarpment of the second Wealden sand course at 

 Andrews Hill south of Billingshurst, and again in a sand-pit at Ebernoe or 

 Eberknoll, west of Kirdford ; all in a direct line, and pointing toward the 

 gorge of the valley in question, between Blackdown and Bexley Hill. But 

 at all these exposures the wave of elevation is very slight. These minor 

 or local distm'bances will be afterwards considered as belonging to the lesser 

 contortions, or puckerings of the Wealden strata. 



t Subsequent observations incline me to believe that this fault or upcast 

 at Langrish is not a continuation of the Greenhurst line ; and that there is 

 no true inosculation of that antichnal with the Winchester hue, unless by 

 the Meon Valley. It is probable that, with the upcast at Woolbeding, and 

 the flexm*e at Midhurst mentioned by Mr. Hopkins (Geol. Trans,, vol. vii. 

 p. 16), the influence of this line of elevation on the escarpment of the 

 South Downs ceases.— -P. J. M. May 1851. 



