John Day fossil beds
Names: John Day fossil bedsJohn Day formation
First appears in Book 1: The Many-Colored Land, chapter 8 (7)
Appearances
B1
B2
B3
B4
What you know
Book 1: The Many-Colored Land
- Ch 8Repeated volcanic eruptions over about fifteen million years buried successive animal populations in ash, forming a formation more than half a kilometer thick.