Uranium Dating & South African Sites?

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Hi all!
Can anyone tell me if Uranium series dating has ever been used on those
troublesome South African sites, and, if not, why? I recently learned
more about the procedures, that they work on breccia and (at least one
isotope) has a half-life of 4.5by. So why wouldn't this be appropriate
for South Africa? Last I read, they were using biostratigraphy to date
the hominids. Is it because the sites are such a mess to begin with, &
the Uranium series is so prone to error, that it is thought not to be
worthwhile to try, or is there another, more technical, reason?
I just know some student is going to be asking me this when we go over
this material next week!
Thanks!
Caroline

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