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[dinosaur] How long did Tyrannosaurus rex exist



Good day, I would like to ask, how long did T. rex probably exist as a species? 
What is the earliest record of its presence in the late Maastrichtian strata? 
It went extinct 66.0 mya, which is quite well known, but when did it first 
appear? Was it 68.5, 68.0 or rather 67.5 mya? Thank you very much, in advance!