THE 
QUARTERLY JOURNAL 
OF 
THE GEOLOGICAL SOCIETY OF LONDON. 
PROCEEDINGS 
OF 
THE GEOLOGICAL SOCIETY. 
DeEcEMBER 22, 1869. 
John Hopkinson, Esq., of 8 Lawn Road, Haverstock Hill, N.; 
Samuel John Sanders, Esq., M.A., Vice-Master of the Beds. Middle- 
Class Public School; and Jabez Church, Esq., C.E., of 17 8 Great 
George Street, Westminster, S.W., and Chelmsford, Essex, were 
elected Fellows of the Society. 
~ The following communications were read :— 
1. On the IRron-orzs associated with the Basatrs of the NorTH-EAST 
of IrnrtAND. By Ratpa Tare, Esq., Assoc. Linn. Soc., F.G.8., and 
JoHn Sinciarr Hoxpen, M.D., F.G.S. 
ConrTENTS. 
I. Introduction. 
II. Petrology of the Iron-ores and associated Rocks. 
1. Section on Slievananee. 
2. Section at Belumford. 
3. Enumeration of Localities. 
4. Deductions from the several Sections. 
ITI. Origin of the Pisolitic Iron-ore. 
1. Suggested Theories. 
(1) Sedimentary Theory. (2) Theory of deposition. (3) Igneous 
Theory. (4) Metamorphic Theory. 
2. Origin of Bole and Lithomarge. 
3. Absence of Boles above the horizon of the Iron-ore. 
4, Metamorphism of Bole. 
5. Analyses of Pisolitic ores. 
IV. Nature and origin of the Ferruginous series at Ballypalidy. 
1. Section at Ballypalidy. 
2. Relation of the strata to the basalts. 
3. Origin of the Iron-ore. 
4. Plant-remains of the series. 
V. Economics and Mineral Statistics. 
VI. General conclusions. 
Tue recent development of a new branch of mining industry in the 
north of Ireland has given us ample facilities for ascertaining the 
VOL. XXVI.—PART I. M 
