Mysterious giant sauropod and weight limit

[Vladimír Socha <Seismosaurus@seznam.cz>]

Good day to all list members,
I've been lately perusing through the archives and one interesting note took my 
attention. Here's the URL:
http://dml.cmnh.org/2001Jun/msg00484.html
"...an unnamed sauropod foungd in Argentina about 2 years ago that estimates 
put at over 160ft. in lenght..." (and is even larger than Argentinosaurus). I 
suppose this is not based on a serious reference. Or is it?

I'd also like to ask, if there was recently any new study on the weight limit 
in sauropods. The values in various resources differ in the range of about 50 
tons (100 - 150 t.) with the most frequent value of around 120 - 140 tons. I 
know this was discussed many times over, but still...after all, isn't size the 
most amazing thing about sauropod dinosaurs? thanks, Vlad