544 A. CHAMPERNOWNE AND W. A. E. USSHER ON THE 
slates Mr. Hall obtained a Lingula. An even conformable junction 
trending W. 20°8. and E. 20° N. separates them from lilac and 
reddish grits and slaty beds shown in a quarry a few chains north 
of Wadding Farm, dipping S. 15° E. at 35°. Mr. Hall identified 
these beds as Cucullea-grits ; lithologically we should have been 
unable to distinguish them from the Pickwell grits and slaty beds, 
upon which they rest conformably, forming a narrow zone about 
twelve chains in width along the southern flanks of the Pickwell 
range, and scarcely distinguishable by feature. In this zone, 8. of 
Challich Farm, south-easterly dips of 50° to 55° were obtained, and 
casts of Cucullea were found by Mr. Hall. 
In the Tone valley, at a few chains north of the Cucullwa-zone, 
a dip 8. 15° E. at 50° was obtained in Pickwell beds; thence to 
Washbattle Mills the characteristic features and vegetation of the 
Pickwell series, constituting the high land of Heydon and Main 
Downs, are unmistakable; but the exposures of rock were too 
slight to afford reliable dips. A fault with a southerly downthrow, 
of which evidence has been obtained near Wiveliscombe, may cross 
the Tone valley near Challich Farm. 
On emerging from the narrow river-gorge (of the Tone) which 
intersects the Pickwellian range, we have the clearest evidence of 
perfect conformity between this series and the underlying Morte 
slates at Washbattle Mills, by a slight deflection of the junction in 
accordance with the physical features, a character distinctly ex- 
hibited in its prolongation westwards. There are no conglomerates 
to be seen, nor any thing to indicate a lapse of time between these 
two subdivisions in North Devon or West Somerset. 
Morte slates are shown immediately above the junction on the 
road to Huish Champflower. The boundary follows the road from 
the Mill eastward to Higher Raddon, and is concealed by Triassic 
rocks near Langley. Along this line the character of the grits * is 
exhibited in three small quarries on the northern slope of Main 
Down and at Higher Raddon, where the beds show 3.S.-easterly dips 
of from 35° to 45°, 
Following the boundary of the Trias and the Morte slates, the 
character of the latter is well shown in Oakhampton House slate- 
quarries, where the characteristic grey slates are somewhat raddled 
in places, the cleavage and bedding being apparently coincident, 
and dipping 8. 15°-20° E. at 70°: by the highroad to Pitsford Hill 
the same southerly dip has been noticed. We did not continue this 
traverse into sheet 20, but obtained good evidence of the undulations 
in the greenish quartz-veined slates of the Morte series which are 
shown in the accompanying section (fig. 5). 
Across THE Quantocks To Cannineron Park. 
At Staple Hill foot, near West Quantocks Head, the boundary of 
the older rocks is sharply defined. Purplish grits in broken con- 
dition are seen at the cottages; and on reaching the open ground a 
* Lilac, red, and purplish-grey grits and slaty beds. 
