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.
Bandstand was picked up by the ABC television network, renamed American Bandstand, and debuted nationally on August 5, 1957. The show took off, due to Clark's natural rapport with the live teenage audience and dancing participants as well as the non-threatening image he projected to television audiences.