How the Grand Canyon could have lost 1 billion years of geologic history
In the Grand Canyon, rock layers preserve a relatively continuous record of Earth’s geologic history going back about 2 billion years. But between 520 million and 1.8 billion years, the record is noticeably empty. It’s as if…
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How the Grand Canyon could have lost 1 billion years of geologic history
In the Grand Canyon, rock layers preserve a relatively continuous record of Earth’s geologic history going back about 2 billion years. But between 520 million and 1.8 billion years, the record is noticeably empty. It’s as if someone broke into a museum…