I actually think your corrections are incorrect. FDR took us off the gold standard. He put us on something else, and Nixon took us off of that. Sorry I can't be more specific, but that is how it went down.
Sorry, but no.
http://en.wikipedia.org/wiki/Gold_standard
http://en.wikipedia.org/wiki/History_of_the_United_States_dollar
The US Citizen was taken off the gold standard, but if you were from Canada, you could turn in all your US Dollars for gold specie. Still on the gold standard.
Here Nixon explains that the US is suspending the gold standard, this was in 1971, FDR was dead.
[video=youtube;rcnhF09QN78]http://www.youtube.com/watch?v=rcnhF09QN78[/video]