They said the sample was contaminated with excess argon.
Using new samples of feldspar and pumice they ‘reliably dated’ the tuff at 2.61 million years, which agreed nicely.
Note that the mere existence of these assumptions do not render the simpler dating methods entirely useless.
In many cases, there are independent cues (such as geologic setting or the chemistry of the specimen) which can suggest that such assumptions are entirely reasonable.
The movie set for release in 2015 and is based on a 2013 psychological thriller novel by M. The two, who have been trying to have a child for years, one day discover a boat that has washed up onshore.
A brief summary of the LS method and some of the problems associated with the technique are given here.
If your browser does not accept cookies, you cannot view this site.
There are many reasons why a cookie could not be set correctly.
So Curtis and others redated the KBS tuff using selected pumice and feldspar samples, and obtained an age of 1.82 million years.
This new date agreed with the appearance of the new skull.