![Around the world, miles of rock are missing. Could 'Snowball Earth' be the culprit? - Los Angeles Times](https://www.latimes.com/resizer/i-tUgXF-1qJnEzZKcvsD-ZeAX4k=/1200x0/arc-anglerfish-arc2-prod-tronc.s3.amazonaws.com/public/6EXVPT7P4FBAXAV755VZW3IAFI.jpg)
Powell had learned to read the layers of desert rocks like pages in a book, and he recognized that the boundary represented a missing chapter in Earth’s geological history. Later, researchers realized it was more like an entire lost volume, spanning roughly one-fifth of Earth’s existence, and that a similar gap existed in many places around the world.
Source: latimes.com – Los Angeles Times