100 PAPERS, ETC. 
say a word as to the extreme care necessary in determining 
what is and what is not a true cast even, of a Devonian 
fossil. My late most valued friend Mr. Baker shewed me 
several supposed casts of these fossils, collected by himself, 
but on their being submitted to the inspection of the 
Geological authorities of London, they were pronounced 
nothing of the kind. At Cockercombe we light upon a 
different variety of slate to any we have yet noticed, de- 
scribed by Mr. Williams as a “ vivid pea-green cerystalline 
slate,” the colour being due to Manganese; it is, however, 
a true clay slate. 
Returning to Cothelstone below the hill, or rather, on its 
slope in the park, we find the slate to be of the greenish 
blue variety, containing occasional casts of encrinites. 
Further east, in a quarry by the road-side, we observe a 
sage-colour clay slate, having a steatitic appearance, and 
which has been analysed by Mr. Draper, of Taunton, with 
the following result, viz. :— 
Siesta. 74 
Alumina, ...... 18°5 
Times. 6°0 
Magnesia ...... 1:0 
99-5 
The odd decimal 5 he describes as containing iron. 
In the sandstone of this quarry may be found small en- 
erinital impressions; the dip of the strata is about 20 deg. 
southerly. At Buncombe Hill, near the four cross roads, 
eastward, the slate varies in colour from slisht olive to 
purplish, and contains abundance of fossil shells, the most 
abundant being atrypa with orthides and spirifera. A few 
encrinital casts also oceur, and the coral Fenestella. The 
glate here is finely laminated : dip southerly, 30 to 35 deg. 
