Abstract
Detailed K-Ar and palaeomagnetic measurements on sequences of basalts from Norfolk Island indicate that the boundary between the Gauss normal and Matuyama reversed polarity epochs has an age lying between 2.36 and 2.45 my. Statistical analysis of all the Norfolk Island age-polarity data yields an age of 2.41 ± 0.01 my for the boundary, but an uncertainty of 0.05 my is regarded as more realistic in terms of the geology. Data from Norfolk Island and elsewhere combined with information from deep-sea sedimentary cores provide an estimate that the Mammoth reversed polarity event extends from 3.09 to 2.99 my ago, and that the Kaena reversed event occurred between 2.92 and 2.84 my ago.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
