[November, 1899.] 



THE 



SCIENTIFIC TKAISACTIONS 



ROYAL DUBLIN SOCIETY. 



YOLUMP: VII.— (SERIES II.) 



III. 



AN ESTIMATE OF THE GEOLOGICAL AGE OF THE EARTH. 



By J. JOLT, M.A., D.Sc, F.R.S., 



Honorary Secretary of the Eoyal Dublin Society ; 



Professoor of Geology and Mineralogy in the University of Dublin. 



DUBLIN: 



PUBLISHED BY THE EOYAL DUBLIN SOCIETY. 



WILLIAMS AND NOKGATE, 



14, HENRIETTA STREET, COYENT GARDEN, LONDON, 



20, SOUTH FREDERICK STREET, EDINBURGH; and 7, BROAD STREET, OXFORD. 



PRINTED AT TEE UNIYEESITY PEESS, BY PONSONBY AND WELDRICK. 



1899. 



