By Professor T. Rupert Jones, F.R.S., F.G.S., Sc. 151 
Sands, had they ever spread over the country, would have been 
least separated from the Chalk.” . . . . “ Blocks of pudding- 
stone, or Greywethers containing flint pebbles, are of rarer occurrence 
in this country [Sheet 13] than those of simple sandstone. They 
may be seen in the neighbourhood of Nettlebed' and Wickham.” 
Small pieces of fossil wood “ have been noticed in the Greywethers.” 
§ 3. 
Descriptive Catalogue of the Rock-specimens in the Museum of 
Practical Geology, &c., 1862, p. 163. 
“Greywether Sandstone. Overton Down, near Avebury, Wilt- 
shire. Map 34, Scattered blocks of this saecharoid sandstone or 
grit lie on the surface of the country in Dorsetshire and Wiltshire 
sometimes (as in the Valley of Stones, west of Black Down, Map 
17, and on the Chalk Downs in the Vale of Pewsey) in such 
numbers that a person may almost leap from one stone to another 
without touching the ground. The stones are frequently of con- 
siderable size, many being four or five yards across, and about four 
feet thick. In Bride Bottom (Valley of Stones) they are often 
conglomeratic, being composed of rounded, sometimes angular, 
Chalk-flints in a base of white siliceous grit ; and in many instances 
the same block furnishes an example of this structure, one portion 
consisting of sandstone, and another of conglomerate, occurring with 
a well-defined line of separation between them. In the village of 
Little Bredy they may be seen in the brook which flows by the 
side of the road; and in many instances, when it has been possible 
to do so, advantage has been taken of their position to build them 
into the walls of the houses.” . . . . “On the turnpike-road 
from Dorchester to Broad Maine [Broadmayne, see above, p. 136] 
blocks of this stone are visible (apparently in place), by the roadside 
at Little Maine, in sands which rest immediately on the Chalk ; 
while several other blocks of it are scattered over the surface of the 
adjoining: fields.” 
§ 4. 
Memoirs Geol. Survey of Great Britain, &. Geology of parts 
of Berkshire and Hampshire, Sheet 12, 1862, by H. W. Bristow 
1 Prestwich, Q. J. G. §., vol. x., p. 126. 
