Takes the same shape of the plant or animal. The space is sometimes filled with mud. The mud hardens and turns into rock. Cast are often made from a mold. The inside of the sedimentary rock isn't hollow.
American Bandstand, 1957. Dick Clark became host of the locally-produced Bandstand in 1956, just before the show was renamed American Bandstand, shortened to ninety minutes, and expanded to a national ABC audience on August 5, 1957.
Clark didn't start hosting until '56. There were three hosts before Dick Clark, Bob Horn, Lee Stewart, and Tony Mammarella. Horn and Lee co-hosted the show (originally known simply as Bandstand) from '52 to '55 when Lee Left. Hrn continued to host until July 9, 1956 when he was fired from a DUI arrest. Mammarella, the shows producer, temporarily hosted the show until Clark was hired.