Table of Contents

cover image

Volume 28, Number 2
21 January 2009

pp 81-166

Las Torres, Torres del Paine National Park, Chile - These granite towers, about 3000 meters high, are the most famous landmark of the Chilean side of southern Patagonia. They formed as an intrusion of granite into softer rock about 12 million years ago. The photograph was taken by Matthew Scott of the Stanford School of Medicine.

View larger image