Gorgon the monsters that ruled the planet before dinosaurs and how they died in the greatest catastrophe in earth's history - Ward, Peter Douglas 1949- (New York Penguin Books, 2004)
"First published in the United States of America by Viking Penguin"-- Title page verso
Includes bibliographical references and index.
Keywords: Catastrophes (Geology); Geology, Stratigraphic -- Permian; Geology, Structural -- South Africa -- Karroo