Source: Ambush Bug Year None #7 (2008)
Type: Alternate Earth
No, it's Supersaur! (At least that's how I call him.) Sadly, that version of the DCU was wiped out in the First Crisis, just as today's Superman won't be here forever.
cough cough
And look! There actually WAS a Supersaurus in nature:
If only he'd been red and blue...
Type: Alternate Earth

cough cough
And look! There actually WAS a Supersaurus in nature:

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(I'm not saying I don't believe.)