This plant is thought to be a living fossil. It has been dated back as far as 270 million years and was abundant in North America, Europe, and Asia during the Cretaceous period. Unfortunately, the tree was wiped out in North America and most of Europe during the K-T extinction event (2). It was thought to be totally extinct but the Chinese had used its seeds as food in the Han dynasty, 206 BCE- 220 CE. It was "rediscovered" in 1691 by Engelbert Kaempfer (2). The tree had survived in China, in the monasteries and temple gardens (2). The Ginkgo biloba tree was later distributed to Japan, Korea, and Europe by seed (2).