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



(A) Northern District of Limestone. 



The first appearance of this limestone on the west is in a quarry near 

 Haverfordwest^ at a short distance to the west of Maudlin Bridge ; whence a 

 band of it, of inconsiderable breadth, extends to Milling near Picton Castle. 

 From thence to the south of Newton the coal-measures lap over and conceal 

 the limestone. In the quarries near the latter place the limestone reappears, 

 and is thence continued by Templeton to Pendine Cliffs in Caermarthen Bay, 

 forming a range about a quarter of a mile in breadth ; except near Pendine, 

 where it is somewhat broader. 



From the point where it first appears, as far as Milling, the limestone rests 

 upon greywacke ; and from Newton Quarries to Pendine Cliffs upon old red 

 sandstone : in either part it sinks beneath the coal-measures. The limestone 

 in this northern district is not very highly inclined, nor is it disturbed like that 

 to the south of the coal-district. At Templeton the dip is about 25° to the 

 south. At the old quarries, at Eglywslwyd, east of Templeton, the strata are 

 horizontal, but incline towards the south as they approach the coal-measures. 

 On the northern side of Marcroes Mountain, near Pendine, the beds dip at 

 about 30° to the south-south-west, and in Pendine Cliff at the same angle 

 to the south-west. 



Pendine is situated half on the limestone, and half on old red sandstone ; 

 the lower limestone-shale being observable at the junction of the two rocks 

 opposite Pendine Great House. The limestone beds in Pendine Cliffs vary 

 from a few inches to ten feet in thickness, and contain the remains of Encrini, 

 Productae, Euomphali, and Spirifers. In the face of the cliff are many caverns, 

 some of which have not been formed by the sea, but simply enlarged by it, in 

 consequence of the water washing out the clay contained in them. At the 

 Green Bridge a brook loses itself in a cavern, which has been traced under- 

 ground 360 yards, and then terminates in a hole eight yards deep. At the 

 distance of about a mile the brook reappears on the coast between Pendine 

 Cliffs and Marcroes Mountain. 



(B) Limestone South of the Coal-basin. 

 This district is subdivided into three distinct bands, which are separated 

 from one another by the intervention of the Pembroke and Orielton districts 

 of old red sandstone. 



Tenbi/ Limestone Band. 

 This band supports the coal-measures from Langum Ferry to Tenby, and 

 rests on the old red sandstone of the Ridgeway from Carew to HoUoways. At 



