The Age and Composition of the Whin Sill and the Related Dikes of the North of England1

Arthur Holmes and H. F. Harwood
Professor of Geology, The University, Durham
Lecturer in Chemistry, Imperial College, London.
1The chemical analyses and calculations of norms have been made by Dr. Harwood. The field work and petrological investigations have been carried out by Professor Holmes, who is also responsible for the writing of the paper.

Mineralogical Magazine; September 1928 v. 21; no. 122; p. 493-542; DOI: 10.1180/minmag.1928.021.122.01
© 1928, The Mineralogical Society
Mineralogical Society (