Mr. De la Beche on the Geology of Southern Pembrokeshire. 15 



Carew the band bifurcates, the western branch passing by Nash to the New 

 Dock-yard at Patterchurch, being bounded on the south by the Pembroke 

 district of old red sandstone, and on the north by the rock of Cosheston 

 Mountain. 



The north-western branch extends by the quarries of Carew-Newton to 

 Langum Ferry, being bounded on the south-west from Carew to Lawrenny 

 by a branch of Milford Haven, but at Lawrenny and at Langum Perry by 

 old red sandstone. From Langum Ferry to Johnston no limestone appears 

 along the boundary of the Coal-basin, this being the line along which trap 

 is protruded, and the coal-measures upon that line being very much dis- 

 turbed. At Johnston, however, the limestone reappears on the northern side 

 of the hill between the trap and the coal-measures, being very much contorted, 

 and occupying a tract about fifty yards broad, and about three-quarters of a 

 mile in length. 



From Johnston eastwards no limestone appears, until we reach the shores 

 of St. Bride's Bay, where, in Gouldtrop Road, two or three beds of that rock, 

 not above twenty feet in thickness, are observed between trap and con- 

 torted coal-measures. (See PI. H. fig. 2.) A continuation, probably, of these 

 beds is seen forced up above the level of the sea, below Gouldtrop Head, at 

 some short distance further to the westward. (See same Plate and figure.) 



The stratification of this band of limestone, along its whole line, is very 

 much disturbed. At Tenby, behind the sluice-wall, the limestone beds are 

 thrown quite over, so as to appear to rest upon the coal-measures. On the south 

 side of the small bay, of which Castle Hill forms the northern side, the almost 

 vertical beds have a northern dip. A few thin contorted beds are there inter- 

 posed between other beds that remain tabular. At St. Catherine's Island, 

 opposite this bay, some beds are vertical ; others dip to the south, their cleav- 

 ages occasioning a deceptive appearance of vertical strata trending north and 

 south. From the cliff under the Paragon to that under the Windmill the beds 

 dip to the south at from 70° to 80°. At HoUoways the dip is to the north-east 

 at 30° ; at St. Florence, to the east at from 20° to 23° ; at Ivy Tower, to the 

 south at from 30° to 40° ; and at Carew, to the south-south-east at 45°. The 

 limestone is seen at one place only in the cliffs near Patterchurch, where it 

 has the appearance of resting on the basset-edges of old red sandstone. 

 North of Langum Ferry-house the limestone is so much contorted and inter- 

 mixed with the coal-measures, that sometimes one formation is uppermost, and 

 sometimes the other. 



Pembroke Band of Limestone. 

 To the south of that of Tenby another band of limestone is found, extend- 



