Everything has its pecking order, and geology is no exception. The cocks of the rocks are the big, swaggering periods of the past that fill books, television programmes and natural-history museums ...

Scientists have identified the geological site that they say best reflects a proposed new epoch called the Anthropocene — a major step toward changing the official timeline of Earth’s history.

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A large geological feature in southern Utah known as the “Double Arch,” the “Hole in the Roof” and sometimes the “Toilet Bowl” has collapsed.