The answer is (a) Mesozoic and it lasted 180 million years.
Answer:
At the height of the initial pandemonium, in 1955-56, a select number of front-runners emerged, stars whose personalities and performing antics set the stage for all that was to follow: Elvis, of course; Chuck Berry, whose definitive guitar style (rooted in swing jazz and the uptown band blues of T-Bone Walker) was as widely emulated as his brilliant, vividly economical lyrics of teenage tribulations and triumphs.
