T Rex and eras/periods - Cretaceous's Maastrichtian.

 https://en.wikipedia.org/wiki/Cretaceous

https://en.wikipedia.org/wiki/Mesozoic

Maastrichtian Mentioned a lot in  https://www.youtube.com/watch?v=wSQs2kzgQJM&t=889s

• Also mentions Big Bend’s Javelina formation (fossils found). 
• Guy guesses that T Rex ancestors maaaaybe came from south (Texas then say New Mexico). 

They say this is of Sue.

Interesting take. I like variety in scales, seems possible.

BTW, they don't have lips.