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.
From his early days as one of the first faces familiar to television audiences in the 1950s, as host of American Bandstand, Dick Clark was a constant. He wasn't just a major force in television, but in the music industry as well, up until his death on Wednesday at the age of 82.