

Mr. De la Beche on the Geology of Southern Pembrokeshire. 17 



St. Goven's Limestone-band. 



This is the southernmost of the three bands belonging to the limestone on 

 the southern side of the coal-basin, and it forms the southern extremity of 

 the Pembroke peninsula. The beds of limestone in this band vary from 

 a few inches to six or seven feet in thickness : they may be seen of the former 

 dimensions at Linney Head, and of the latter at St. Goven's Head. The lower 

 limestone-shale separates the limestone from the old red sandstone, as may 

 be seen in a cove north of Stackpole Quay. Encrinites and Productae occur 

 in some of the beds of this band of limestone. 



The sands extending from Newton Burrows to Linney Farm conceal the 

 junction of the limestone with the old red sandstone. Near Linney Head the 

 strata of limestone are horizontal ; at St. Goven's Head they dip gently towards 

 the south. In many parts of the band the strata are greatly disturbed : they 

 are contorted near the Eligug Stack* (see PI. II. fig. 4.); they are vertical 

 and contorted near Stackpole Quay (see PI. II. fig. 5.); and at a short di- 

 stance to the north of the latter place they abut perpendicularly against old 

 red sandstone. 



Between Linney and St. Goven's Heads there is some fine picturesque 

 scenery. The coast is indented in a most singular manner. Cauldrons, 

 similar to the far-famed Boilers of Buchan, near Peterhead in Scotland, are 

 found in three or four places. One or two occur near Linney Head ; another 

 on the western part of Bullslaughter Bay ; and the most celebrated, named 

 Bocheston Meer, to the west of St. Goven's Chapel. When the sea rushes 

 into them during a heavy gale of wind, the noise is heard to a considerable 

 distance. The cliffs are tenanted by multitudes of sea-birds, whose clamour 

 adds much to the wild effect of the scenery. 



§ 5, — Coal-measures. 

 Along the northern boundary of this western extremity of the great South- 

 Welsh coal-basin, the coal-measures rest, from Broadhaven in St. Bride's Bay 

 to the lime-quarries near Maudlin Bridge, upon greywacke : from those quar- 

 ries to Milling, upon carboniferous limestone : at Slebech, on greywacke : at 



* The Eligug Stack is a rock at a short distance from the land, south of Linney and Penny- 

 holt Farms. It is sometimes called Peunyholt Stack; and the name of Eligug Stack is given to the 

 larger of two rocks in Bullslaughter Bay. But the former is the real Eligug Stack of the sailors. 

 It is so named from the sea-bird, Alcu Tarda Linn., called Eligug by the country-people, which 

 frequents this rock and other parts of the adjacent coast in great numbers, from the end of April 

 or beginning of May to the beginning of August. 

 VOL. II. SECOND SERIES. D 



