A Vertebrate Fossil Is Found in Antarctic; Amphibian Fossil Found in Antarctica
W Sullivan repts fossil fragment of large amphibian that lived in subtropical forests near South Pole more than 200-million yrs ago found in Antarctica by Ohio Univ team led by P J Barrett; says fossil is 1st indication that land vertebrates once inhabited region; says discovery supports theory that continent was once linked to other land masses; Amer Museum of Natural History curator Dr E H Colbert comments on discovery; describes specimen; illus