Keywords
Received 7 August 1992; published 13 April 1993
New Zealand Journal of Geology & Geophysics, 1991, Vol. 36: 131—135
0028Ð8306/06/3601—0131 ©The Royal Society of New Zealand 1991
PDF file of entire paper: medium quality (416K); (scanned from paper original: notes about this process). Digitisation of this article from the printed journal was kindly facilitated by the Geological Society of New Zealand