The ancient underwater forest about eight miles off the coast of Gulf Shores, Alabama, is known as a time capsule from the last ice age—and for the first time, researchers understand why. Chemical and pollen analyses found the bald cypress trees were buried in sediment from swamp and marsh ecosystems, like those in southeastern United States today. Such low-oxygen environments helped preserve the wood, which is more than 60,000 years old and grew on land at a time when sea levels were much lower than they are today.
