Figure 18. Internal isochron showing mineral age of two aliquots of monazite from sample 796-48,278. The lower five data points are based on Th/Pb isotopic ratios of one aliquot, and the upper points are for the other aliquot.
This page is https://pubs.usgs.gov/bulletin/b2143/fig18.html
Maintained by John Watson
Last updated 01.22.98