BEISTOL BUILDING STONES. Ill 



breccia of the Magncsian. Limestone, probably brought from 

 Broadfield Down, six miles west, or from Bast Harptree, 

 six miles south." Hauteville's Quoit is also given by Mr. 

 Dymond as composed of Limestone (Journ. Brit. Arch. Assoc, 

 Sept., 1877). 



I venture to think that Mr. Dymond is in error in some 

 of his determinations. The Quoit is certainly not Limestone 

 but is a close brown Sandstone, somewhat resembling Sarscn. 

 The two Mr. Dymond mentions as New Rod Sandstone— the 

 rook of the site — are in my opinion of Palasozoic age. In 

 addition to that so marked by Mr. Dymond as Dundry, 

 there are two or three others, notably the last stone in the 

 W.E. avenue and the two stones in the lower tyning, marked 

 by Mr. Dymond as breccia. The stone marked limestone 

 in the S.W. circle is a red chert. The stones in " The 

 Cove " are quite different from most of the others, being 

 unaltered soft Dolomitic Conglomerate. One stone in the 

 Great circle, and one in the S.W. circle, are of a similar 

 nature. 



With regard to the groat majority of the stones, the term 

 "breccia of the Magnesian Limestone" seems particularly 

 unfortunate as applied to stones which are silicious through- 

 out. For many of them I do not think we need go so far' 

 as Broadfield Down 9r East Harptree. They are very pecu- 

 liar in character, composed of a rod silicious breccia. The 

 included fragments are many of them hollow, and contain 

 quartz crystals ; many are concentrically banded, agate 

 fashion. I regard the rock as a Dolomitic Conglomerate, 

 much altered by the percolation of silicious and ferruginous 

 waters, the silica and iron of which have largely replaced 

 the original materials (or some of them, for many of the 

 included fragments would seem to be Millstone Grit, while 

 others may have been originally Mountain Limestone). 1 



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