Reviews— Geological Survey of Basingstoke. 83 
of the Upper Greensand inlier of Kingsclere on the west, and a portion 
of the Wealden area on the south-east. his latter tract, drained by 
the head-waters of the Wey, takes in less than a square mile of the 
parish of Farnham in Surrey. 
The lowest formation exposed is the Gault, and the Folkestone 
Beds of the Lower Greensand have probably been reached in a well 
in the Wey Valley. The Gault, no doubt, underlies the whole of the 
area, but nothing is known of the underground disposition of the 
strata beneath, nor of the depth to the Paleozoic floor. 
Particulars are given of the Gault, with the zone of Dowvilleiceras 
mammillatum at its base, and that of Hoplites interruptus above; and 
also of its fossils and phosphatic nodules. ‘he Upper Greensand, 
consisting largely of malmstone, siliceous and calcareous, belongs to 
the zone of Sch/loenbachia rostrata, and the highest beds adjoining the 
Chloritic Marl are locally impregnated with phosphatic matter. The 
phosphatic beds at the base of the Chalk, which contribute so much 
to the fertility of the soil on the Chloritic Marl, were described more 
than sixty years ago by Paine & Way, but the pits which yielded 
many fossils in the parishes of Bentley and Farnham have long been 
filled up and obliterated. The Chalk divisions range from the zone of 
Schloenbachia varians to that of Warsupites testudinarvus, and much new 
information is given regarding the strata and their fossils, including 
the sub-zone of Heteroceras reussianum and the Uintacrinus Band. 
Despite the great unconformity between Chalk and Reading Beds 
no evidence of disrordance has been observed in the district. The 
surface of the Chalk was even where the junction of the formations 
could be seen, but in two localities the perforations of some boring 
animal were seen on the Chalk floor. The author assigns to the 
Kveading Beds the blocks of greywether sandstone which occur here 
and there in the district. 
The London Clay, which extends over a considerable area, has 
yielded a good many fossils, and it attains a thickness of 385 feet near 
Odiham. The author remarks that it is probably not more than half 
that thickness in the north-western part of the district. Westwards, 
in the Andover country, the thickness of the London Clay has been 
estimated at from 60 to 100 feet, while south of Newbury it is about 
60 feet, and thence it diminishes further west and to the north. 
The Bagshot Series 1s described under the headings of Lower Bagshot 
Beds, Bracklesham Beds, and Upper Bagshot Beds—perhaps because 
this classification was adopted on the colour-printed map which, 
though issued in 1905, was based on the hand-coloured map of 1897. 
The grouping, therefore, differs from that adopted in the Andover 
Memoir of 1908, wherein the term Bagshot Beds is restricted to the 
Lower Bagshot Beds. The Upper Bagshot Sands of the London 
Basin are now usually grouped with the Barton Beds. 
There is an interesting chapter on the tectonic structure and drainage 
features, illustrated by a map showing the lines of anticline and 
syncline, while the author points out the relations of the streams to 
the geological structure. 
The Plateau gravels are regarded as of fluviatile origin, and as 
“remnants of old alluvial flats or flood-plains, developed during 
