Geological Society of Glasgow. 221 



nodules, chiefly of limestone, wliieli lie had obtained from a bed of 

 black bituminous shale, exposed at various quarries in the district of 

 East Kilbride ; many of them were perforated with holes, resembling 

 in size, shape and depth, those formed by certain of the mollusca. 



Mr. Bennie also exhibited, from the shales of the same district, 

 what he considered to be specimens of very minute Crinoids. 



Professor Young and Mr. John Young read a joint paper on 

 " Local Unconformity, as illustrated in the Carboniferous Eocks near 

 Bishopbriggs." In Coltpark Quarry Mr. Young had discovered a 

 series of vertical beds beneath the nearly horizontal main post of the 

 Bishopbriggs sandstone ; and in this paper the authors described and 

 illustrated by diagrams the detailed survey they had made of the 

 neighbourhood. They considered that the vertical beds are a part 

 of those lying beneath the Cowglen limestone ; that about twenty- 

 five feet of strata have been removed by denudation ; and that the 

 extremely local nature of the disturbance is such as might be due to 

 an intrusion of greenstone, of which two examples are seen not far 

 off. They concluded with some general remarks on local uncon- 

 formity without disturbance, as abundantly illustrated in the same 

 district, and on the uses of the terms unconformity and overlap. — J. A. 



II. March 28th. — Dr. Young, President, in the chair. 



T. Kupert Jones, Professor of Geology, Eoyal Military College, 

 Sandhurst ; James W. Kirkby, Simderland ; Henry Woodward, 

 F.G.S., of the British Museum ; and J. H. M'Chesney, Professor of 

 Geology, University of Chicago, were elected honorary members ; 

 and Messrs Andrew Mackie, M.D., Abbotsford Place, C. B. Aikman, 

 writer, St. Vincent Street, Alex. Smith, Little Hamilton Street, and 

 John Anderson, painter, St. Enoch Square, were elected resident 

 members of the Society. 



Dr. Young exhibited specimens of a variety of MegalicJithys, which 

 in Scotland occurs only at Quarter, near Hamilton, and has, he be- 

 lieves, a similarly restricted range in North Staffordshire, which 

 contrasts with the wide distribution of M. Hibberti. The scale is not 

 enamelled, and is thickly covered with alternating larger and smaller 

 tubercles, giving a very characteristic and elegant ornamentation. 

 He exhibited the scales of genera allied to Megalichihys, and pointed 

 out the difficulty of determining genera from single scales, the inter- 

 mediate varieties between distinct types being numerous. Only a 

 few scales of the Quarter fossil have been found, but further dis- 

 coveries may justify its erection into a separate genus ; meanwhile 

 it is best to retain it as a species. 



Mr. J. Wallace Young read a paper " On some Local Sandstones." 

 The results may be shortly summed up as follows : — 1st, That in 

 the greater number of sandstones examined, the cementing material 

 consisted of carbonates ; 2nd, That very considerable (j^uantities of 

 the carbonates of iron and magnesia frequently accompanied the 

 carbonate of lime, although no definite ratio seemed to exist be- 

 tween them ; 3rd, That these sandstones were harder the greater 

 the proportion of carbonates they contain ; 4th, Mica was found to be 



