152 Scientific Proceedings, Royal Dublin Society. 
The rocks in many places on the northern part of this synclinal 
show signs of violent horizontal pressure along the north Devon- 
shire cliffs, more particularly near Hartland Point, E. of Hartland 
Point and W. of “ Gallantry Bower,” Clovelly Point, and further 
east near Clovelly. 
To the north of Barnstaple are found the celebrated beds of 
Cucullea sandstone, and the sandstones containing plant remains, 
of Baggy Point and Marwocd; which are now generally regarded 
as lower carboniferous, and comparable with similar beds well 
developed in the south of Ireland.* 
Still further to the north occurs the well-known band of 
marine limestone, passing from Ilfracombe, through Berry Narbor, 
and running east towards Exmoor forest. 
This band of limestone, as well as the superincumbent slate rocks 
to the westward at Bull and Morte Points, dips to the south. To 
the N. of this calcareous band, at Lynmouth and Lynton, the rocks 
consist of horizontal flaggy sandstones, forming the summit of 
an anticlinal axis half-way between Ilfracombe and Minehead, in 
Somersetshire. These sandstones are the lowest and oldest rocks 
in north Devonshire. 
At Minehead the rocks are formed of highly contorted strata, 
of red sandstone at the base, covered by thick beds of yellow 
sandstone, with a general dip to the E. of N. 
The following is a rough estimate of the thicknesses of the 
several parts of the Devonian rocks :— 
Devonian Proper. 
1°. From the lowest beds at Lynmouth, occupying the summit 
of the great anticlinal (flaggy horizontal beds) to the Ilfracombe 
marine limestones, 4,400 feet. 
2°. From the Ilfracombe limestones to the Cucullea and plant 
beds of Baggy Point and Marwood, 5,200 feet. 
Carboniferous Proper. 
3°. From the Cucullwa and plant beds to the flinty calcareous 
slates of Barnstaple, 2,200 feet. 
4°, The synclinal trough lying between the flinty Barnstaple beds 
and the impure limestone beds of Okehampton, 4,600 feet. 
_* This view was put forward by me ina paper read before the Geological Society of 
Dubdlinin January, 1855. Journal, Geol. Soc, Dublin, Vol. VI., pp. (227-241). ’ 
