152 History of the Sarsens. 
and W. Whitaker, p. 51. “ Blocks of hard sandstone, conglomerate 
and grit, which are known by the name of Greywethers, Sarsen 
Stones, or Druid Stones, are not uncommon in this district. They 
are frequently made use of to keep vehicles from running against 
the banks by the roadside, or against the corners of houses.” 
Holly Wood, N.N.W. of Thatcham, and Silchester Common, are 
localities mentioned; also as follows:—‘‘There are a couple of 
Greywethers composed of rounded flint-pebbles and angular flints 
imbedded in a base of ferruginous grit, by the side of the road from 
Odiham to Wanborough [Hants], about a couple of hundred yards 
beyond the four cross-roads.”” (Page 51.) 
“Tn a field south of North Standen Farm [near Hungerford] 
there are some large blocks of ‘ pudding-stone, which seem to be in 
place, and are perhaps hardened masses of the ‘ pebble-beds’ of this 
formation” [Woolwich-and-Reading Beds]. (Page 26.) 
§ 5. 
Memoirs Geol. Surv., &. Geology of parts of Middlesex, 
Hertfordshire, Buckinghamshire, Berkshire, and Surrey, Sheet 7, 
1864, by W. Whitaker, p. 71. “ Greywethers and Pudding-stones.” 
Mr. Whitaker agrees “ with Mr. Prestwich, who has treated of the 
origin of these blocks in great detail, that in this district they have 
been derived in great part from the Woolwich-and-Reading Beds, 
although ” he has “ been led to think that at the western end of the 
London Basin, where they are present in greater numbers, their 
origin may be traced to the Bagshot Sands.” 
Page 72. The “Greywethers are found over the London Clay 
country, and far from the outcrop of the Reading Beds, which would 
accord with their derivation from a formation above rather than from 
one below the London Clay. I am led to think, therefore, that 
these loose blocks may have come from various beds, and that in 
this district [Sheet 7 of the Geol. Survey Map] their origin may 
be traced not only to the Reading Beds, but also to the Basement- 
bed of the London Clay and to the Bagshot Sands.” 
Il.—The Guide to the Antiquities of North Wilts. 
My attention has fortunately been directed to the magnificent 
volume on British and Roman Antiquities of North Wilts and the 
