XVI GEOLOGICAL FEATURES 



dish-brown sand containing some lighter- coloured sand and 

 rolled flint-pebbles up to a pound in weight. The depth or 

 throw of the fault is not known, as it occurs just at the top 

 of the slanting side of the pit. Red clay with large broken 

 flints covers the top of the chalk and sand, and fills up 

 hollows in them. 



Other sections in the Chalk, where some of the ordinary 

 chalk fossils (especially Echinoderms and Corals surrounded 

 by flint) and a few scales of Pishes have been obtained, 

 may be met with near Rabley Copse, at Poltoii Farm, on 

 the Pewsey Road beyond Granham Farm, on the Porest 

 Hill (where spines of Echini have been found), at Pyfield on 

 the Bath Road (where a few Pish-scales have been found), 

 and about two miles beyond Lockeridge on the road to 

 Alton Barnes. 



Fragments of the fossil shell, Inoceramus, occur in 

 abundance in the railway- cutting on Granham Hill : also, a 

 hinge and pieces of the shell surrounded by flint have been 

 found in the section through the Roman Road to Old Sarum 

 where it ascends the hill opposite to Mildenhall. These 

 fragments sometimes bear traces of having been perforated 

 by the Cliona or by boring- annelids. 



On the Forest Hill, a hinge and adjacent parts of a very 

 large shell (probably Inoceramus Cuvieri) have been found. 

 The hinge is nearly straight, and is five inches long and 

 an inch thick ; the parts of the shell at the ends of the hinge 

 branch off at right angles to it, and are two-thirds of an inch 

 in thickness. 



Chalk flints are often found to contain quartz-crystals, 

 and beautiful specimens of sponges which have been trans- 

 formed into chalcedony, and sometimes small nodules of 

 iron-pyrites. 



Between Granham Hill and Martinsell the Chalk is 

 covered by a deposit of the boulder-clay, which extends 

 westwards as far as Clatford Bottom and probably forms 



