In some places, 550 million-year-old rock sits on rock that has existed as long as 3 billion years. Nothing's in between. It's called the Great Unconformity, and some researchers believe it's the result of one massive cataclysmic event in Earth's history.
Visitors to Pikes Peak in Colorado may not notice that anything is amiss, but ask a geologist and she'll tell you that something is missing.
At rocky sites across America, including Pikes Peak and the Grand Canyon, 550 million-year-old rock sits on top of rock that has existed as long as 3 billion years. But there's nothing in between. It's as though that time period between 3 billion years ago and 550 million years ago has literally been wiped from Earth.It's called the Great Unconformity, and some researchers believe it's the result of one massive cataclysmic event in Earth's history.
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