Cast Iron Dolphin and Scallop Shell Fountain Basin Early 20th CenturyA charming smaller cast iron Dolphin and Scallop Shell Fountain basin. Early 20th Century. Beautifully cast the bowl is a thick iron scallop shell resting on a Dolphin's tail upon a stepped base. With great patination, this mythological piece would look stunning as a central smaller pool feature or part of a larger assemblage or grotto.