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.
American Bandstand began as a local Philadelphia show called Bandstand, which made its debut October 13, 1952 on WFIL-TV Channel 6. The series was retitled American Bandstand on August 5, 1957 when ABC began broadcasting it nationwide. For its first 6 seasons, American Bandstand aired Mondays through Fridays.