dead and gone vs dinosaur

Synonym of dead and buried 

Any extinct reptile, not necessarily belonging to Dinosauria, that existed between about 230 million and 65 million years ago. 

Something or someone that is very old or old-fashioned, or is not willing to change and adapt. 

any member of the clade Dinosauria other than birds. 

any of the animals belonging to the clade Dinosauria, especially those that existed during the Triassic, Jurassic and Cretaceous periods and are now extinct. 

Anything no longer in common use or practice.