Proceedings of Session 1888-89

Abstract

Society's Rooms, 207 Bath Street, 11th October, 1888. Mr. William Jolly, F.G.S., Vice-President , in the Chair. Mr. Robert Dunlop exhibited specimens of Altered Intrusive Dolerite, the “White Horse” of the miners, from the Lanarkshire coalfield; also Plant remains from the Airdrie district, including Cyclothea (a new genus), Lepidodendron Peachii, Cordaites , sp., leaves and stem. Remarks on the dolerite were made by Messrs. John Young, F.G.S., Sommerville, Blair, F.G.S., and other members. It was stated that in mining phraseology altered columnar coal was known as “Black Horse.” Mr. James B. Murdoch, F.R.Ph.S.E., Honorary Secretary , exhibited a specimen of a rare fossil crustacean, Prestwichia rotundata , Woodward, found in Carboniferous Shale near Stevenston, Ayrshire. Unlike its congeners, the Trilobites and Eurypterids, this form is still represented in recent seas by the nearly-allied King- or Horse-shoe Crab. It has only been found previously in Western Scotland near Kilmaurs. Its occurrence in the present locality is another proof, if one were needed, that the freshwater or brackish-water strata of the Upper Coal Measures are prolonged westwards. The Kilmaurs specimen was described and figured in the Transactions , vol. ii., part 3, page 241. Mr. Dunlop said that when Mr. B. N. Peach of the Geological Survey was identifying some fossils from strata near Airdrie he had found and named an imperfect example of this rare limuloid form. Mr. James White, Honorary Librarian , read a paper entitled “Notes on Gairloch, Ross-shire.” [See p. 192.] The paper was illustrated by diagrams and by specimens of the rocks of This 250-word extract was created in the absence of an abstract