102 PAPERS, ETC. 
argillaceous than at Edgborough or Adsborough, and the 
colour more of a purple hue. Passing round by Durston, 
at full a quarter of a mile from the extreme south-east end 
of the Quantock range, Mr. Pring has discovered a small 
bed of argillaceous slate and sandstone of a reddish colour, 
and which he supposes to occupy an area of about 20 acres, 
and which is entirely omitted in the Ordnance Geological 
Map. Further north to West Monkton we find a similar 
rock to that at Thurloxton, but containing perhaps more 
gritty, hard, sandstone beds. Exposed in the road to 
Cheddon Fitzpaine, we observe a remarkable change to a 
hard siliceous slate of an olive green colour, and gradually 
passing at Hestercombe to the whet-stone grit, and in the 
publie road west of Hestercombe, dipping at the high 
angle of 70 deg. or thereabouts. Near this spot we 
meet with the celebrated granite, or rather syenite dyke, 
discovered by Mr. Horner in 1814, the slates becoming 
more close and hard as we gradually approach it, the effect 
of igneous action. Mr. Horner thus describes his most in- 
teresting discovery :—-“ In passing through the village just 
named (Cheddon), I observed in the street a small block 
of stone, differing in appearance from any I had found pre- 
viously, and, upon examination, I found it to be granite, a 
rock I had searched for before without success, and, indeed, 
this is the only place where I saw an unstratified rock in 
the whole distriet, the porphyry and green stone which 
accompany this formation in Devonshire being wholly 
wanting here. On enquiry, I found that this granite, 
called by the country people ‘pottle-stone,’ came from an 
old quarry, not far distant, in the grounds of Hestercombe, 
belonging to Mr. Warre. My informant brought out of 
his house a whetstone, which he said came from another 
quarry close by the pottle-stone. It was a greenish com- 
