55 



It is made of Cornisli granite, probably brouglit from Dart- 

 moor ; it is twelve inclies in diameter, and six inclies thick, and 

 is the only specimen of this material which we have found. 



This, and a portion of a molar of a Yolcanic Grit from 

 Andernach, on the Ehine, and several parts of these early 

 querns composed of Upper Grreen Sand, presented, when dressed, 

 a biting tooth, that made them suitable for grinding purposes, 

 not so, however, the next series, Avhich were composed of differ- 

 ent members of the oolitic formation, of which we have met 

 with examples in Dorsetshire for the first time. 



The annexed figure is of a perfect one of these, which though 

 not dug up at the spot we have been describing was got from 

 the same hill, probably turned out in removing the soil from a 

 quarry : — 



/: 



-A 



^ 



FIG. C. — A KOMAK QUEEN OR HAIs'D MOLAB OF GREAT OOLITE. 



This perfect example was made from a block of Great Oolite, 

 probably from the Bath district ; it measures fifteen inches 

 across, and is 4A- inches thick. Like all our examples it was an 

 Upper Millstone, the nether stone being far less frequently met 

 with. 



Portions of Molars of the Inferior Oolite from Ham Hill, and 

 even from some of the coarser beds of this rock were got out of 

 our diggings, and they are interesting as showing that where 

 stone abounded, soft, and not the best lasting materials were 



