Wemerian Natural History Society. 18g 



terpentine occurs in great abundance, in beds, in the oldest 

 clay-slate and newest mica-slate, and hence must be referred 

 to the oldest or first serpentine formation of Werner. 



The island of Papa Stour, situated on the west coast of 

 the Mainland, (as the largest of the islands is called,) con- 

 tains no primitive rocks, but appears to be entirely composed 

 of floetz rocks. These are conglomerate, greenstone, clay- 

 storte, porphyritic stone, homstone, (perhaps clinkstone, ) 

 and sandstone. The sandstone, as appears from observa- 

 tions made in this island and other parts of Shetland, pro- 

 bably belongs to the oldest coal-formation : it is uniformly 

 situated below the other rocks above mentioned. 



As Mr. Fleming announced his intention of again ex- 

 amining the whole of the Shetland islands, and of construct- 

 ing mineralogical maps of them, in which the rocks should 

 be laid down according to their relative antiquity and extent, 

 much valuable information may be expected. 



At the meeting of the Society on the 19th of November, 

 Mr. Mackenzie, jun. of Applecross read a short Account of 

 the Coal-formation in the Vicinity of Durham. From the 

 precise and accurate description communicated by this gen- 

 tleman, the rocks appear to belong to the oldest coal-for- 

 mation of Werner. During the course of his observations; 

 he explained what is called the creep by miners, and exhi- 

 bited specimens of the different rocks, with a section of the 

 coal-mine of Kipia, in which both the miners' and the sci- 

 entific names of the different strata were inserted. 



At the same meeting, Dr. Ogilby, of Dublin, read the 

 continuation of his Mineralogical Description of East Lo- 

 thian, describing the different veins which he observed in 

 that tract of country. These he considered as of three dif- 

 ferent periods of formation, viz. 1. Such as are derived from 

 partial formations subsequent to the floetz-trap, which are of 

 rare occurrence ; 2. Veins of the different rocks of the forma- 

 tion penetrating the older beds; and 3. Those of contem- 

 poraneous origin. He then enumerated and described, ac- 

 cording to the manner of Werner, veins of greenstone, 

 jasper, quartz, heavy-spar, and care-spar. 



At 



