326 Reports and Proceedings — Geological Society of London. 



have been illustrated. To awaken the interest of the student and 

 stimulate fresh observations, the author has given in the nineteen 

 plates, and partly also in the text, figures of all the species of moliusca 

 hitherto known from the late Glacial and post-Glacial deposits of the 

 Christiania region, and these have been excellently and faithfully 

 drawn by Froken Sigfrid Bergh, the artist to the University of 

 Christiania. The geologists of this country and elsewhere, to whom 

 Norse is an unknown tongue, will also much appreciate the full 

 summary in English of the contents of the wor^k, extending over 

 35 pages, which the author has prepared, G. J. H. 



lasiPOi^Ts ^^n^HD :PI^OGElElx^II^^a-s. 



Geological Society of London. 



I— April 30th, 1902.— Professor Charles Lap worth, LL.D., F.R.S., 

 President, in the Chair, 



Mr, J. E. Marr exhibited some specimens from a metamorphosed 

 metalliferous vein several inches wide, which he had discovered in 

 the basic andesites near the Shap Granite, in a quarry close to the 

 high road, north of the spot where it crosses Longfell Gill. 



The minerals of the vein include quartz, calcite, garnet, epidote, 

 hornblende, galena, iron-pyrites, and copper-pyrites. Some of the 

 garnets are about an inch in diameter. The epidote and the horn- 

 blende tend to form distinct bands on the margin of the vein. The 

 other metamorphic phenomena recall those described by the exhibitor 

 and Mr, Alfred Harker, in the case of large vesicles occurring in the 

 same rocks. 



The specimens are of interest as showing : — 



(i) The existence of metalliferous veins in Ordovician rocks which have been 

 formed in pre-Carboniferous times, for the Shap Granite which has produced the 

 alteration is itself pre-Carboniferous. 



(ii) The alteration of a metalliferous vein of complex composition by pyro- 

 metamorphism, an occurrence which the exhibitor believed had not previously been 

 recorded. 



(iii) The possibility that some of the highly crystalline rocks of a complex 

 of regionally metamorphosed rocks may owe their characters to hydrothermal 

 action having formed veins along the parallel divisional planes of pre-existing 

 rocks, these veins having been subsequently altered by pyrometamorphism. 



The following communications were read : — 



1, " The Origin and Associations of the Jaspers of South-Eastern 

 Anglesey," By Edward Greenly, Esq., F,G,S, 



Ked jasper and jaspery phyllite are widely distributed in the 

 southern and south-eastern parts of Anglesey, in the districts of 

 Newborough, Pentraeth, and Beaumaris, They are associated with 

 limestones, diabases, serpentines, and with grits and shales. They 

 have been much modified by earth-movements, which have produced 

 brecciated and schistose structures; but where original structures 

 have survived, the true relations of the rocks can often be seen. 

 The diabases have the same characters as the pillowy and variolitic 

 rocks so often associated with radiolarian cherts and jaspers in many 



