Reports and Proceedings — Geological 'Society of London . 9 1 



A comparison is instituted between the Purbeck Beds of the Vale 

 of Wardour and those of the Dorset coast, etc., and some remarks 

 are made upon the physical conditions under which the beds were 

 dej^osited. 



2. " On a Picrite and other Associated Eocks at Barnton, near 

 Edinburgh." By Horace W. Monckton, Esq., F.L.S., F.G.S. 



The object of this paper is to describe a cutting on a new railway 

 in Bai-nton Park, where there is an excellent exposure of picrite. 

 It consists of serpentinized olivine, augite, mica, iron oxide, and a 

 little plagioclase-felspar, with a variable amount of interstitial 

 matter. In many respects it comes very near to the picrite of 

 Inchcolm, which island is 4^ miles north of Barnton cutting. It 

 differs from the picrite of Bathgate, and the probability is that the 

 Barnton rock is an offshoot from the same magna as that which 

 supplied the Inchcolm rock. 



Besides the picrite other igneous rocks from the same cutting are 

 described — in particular, a rook with porphyritic crystals of a green 

 mineral replacing olivine, or more probably augite, and a great 

 quantity of brown mica in small flakes and crystals. It is suggested 

 that the name of mica-porphyrite might be given to this rock. 



3. "On a' variety of Ammonites (Stephanoceras) suharmatus, 

 Young, from the Upper Lias of Whitby." By Horace W. Monckton, 

 Esq., F.L.S., F.G.S. 



The author describes an ammonite found by himself in 1874 

 near Sandsend, 3 miles north-west of Whitby. He thinks it was 

 not actually in situ, but lying with a number of nodules on the floor 

 of an old alum-pit, although he has no doubt that it is from the 

 Alum Shale of the Upper Lias. A peculiar arrangement of the 

 costse as they cross the siphonal area distinguishes the specimen 

 from other Whitby ammonites known to the author. It bears a 

 strong resemblance to a shell figured as A. suharmatus by D'Orbigny, 

 "Terr. Jurass.," pi, Ixxvii., but is unlike the figures of that 

 species given by other authors. 



IL— December 20th, 1893. — W. H. Hudleston, Esq., M.A., 

 F.R.S., President, in the Chair. The following communications 

 were read : — 



1. " On the Stratigraphical, Lithological, and PalEeontological 

 Features of the Gosau Beds of the Gosau District, in the Austrian 

 Salzkanimergut." By Herbert Kynaston, Esq., B.A. (Communicated 

 by J. E. Marr, Esq., M.A., F.KS,, Sec.G.S.) 



This paper, after referring to the previous literature of the subject, 

 treats of the situation and physical aspects of the Gosau Valley, 

 the distribution of the Gosau Beds, their stratigraphy, palasontology, 

 and geological horizon, and the physical conditions under which they 

 were deposited, and comparison is instituted between the Gosau 

 Beds and the equivalent beds of other areas. The author shows tliat 

 Hippurites occur at two horizons in the Gosau Beds, — a hippurite- 

 limestone immediately above the basement-conglomerate being 

 characterized essentially by Hippurites cornu-vaccinum, which is 



