Geological Society of London. 139 



a slow change of conditions, and the fauna points to slow ti-anquil 

 sublittoral conditions. The author reserves his views as to how 

 the rock-bed obtained its ferruginous elements. 



He gives a description of the palfeontology and economic uses 

 of the deposits, and appends analyses of various ironstones from the 

 district, made by the aid of Sir B. Samuelson. 



3. " Notes on the Geology and Mineral Resources of Anatolia 

 (Asia Minor)." By W. F. Wilkinson, Esq., F.G.S. 



The route traversed from northwards to southwards through the 

 city of Broussa lay through a country composed of sedimentary 

 rocks (largely limestones with some shales and conglomerates). In 

 the mountains metamorphic rocks were met with, and also igneous 

 rocks. The principal igneous rocks noticed are granites and 

 serpentines ; in the latter chrome-iron-ore occurs, and is worked. 



IL— January 23rd, 1895.— Dr. Henry Woodward, F.R.S., Presi- 

 dent, in the Chair. The following communications were read : — 



1. " Carrock Fell : a Study in the Variation of Igneous Rock- 

 masses. Part II. The Carrock Fell Granophyre. Part III. The 

 Grainsgill Greisen." By Alfred Harker, E^q., M.A., F.G.S. 



The augite-granophyre of Carrock Fell is first described in its 

 normal development, special attention being drawn to the various 

 types of micrographic intergrowths which it exhibits. The varia- 

 tion of the rock is next examined, and, in particular, a curious 

 basic modification which occurs near its junction with the gabbro 

 described in a former paper. The granophyre here passes into a 

 coarse type rich in augite, iron-ores, and apatite, its silica-percentage 

 falling to as low as 58. The author attributes this to the acid 

 magma having incorporated in itself portions of the highly basic 

 margin of the gabbro. The latter rock seems to have been fused or 

 dissolved by the magma, with the exception of certain of its more 

 refractory minerals which survive in the modified marginal part of 

 the gi'anophyre. 



The latter part of the paper deals with a remarkable quartz-mica- 

 rock found on the north side of the Skiddaw granite. It differs in 

 some respects from the Cornish greisens, and resembles in its mode 

 of occurrence certain pegmatites in the Scottish Highlands. The 

 author considers the rock to have been extruded from the granite 

 in connection with the post-Silurian crust-movements of the district, 

 while its composition has probably been further modified by sub- 

 sequent chemical changes. 



2. "The Geology of the Country around Fishguard (Pembroke- 

 shire)." Ry F. R. Cowper Reed, Esq., B.A., F.G.S. 



The tract of country forming the subject of this communication 

 occupies the northern part of Pembrokeshire, from Newport to 

 Strumble Head. All the beds are of Ordovician age, with the 

 possible exception of those on Dinas Island, and have a general east- 

 to-west strike with a high dip to the north. Arenig Slates occupy 

 the southern part of the district. Typical Llanvirn Beds with the 

 jP/acopan'a-fauna occur at Fishguard, and above them the Didymo- 



