What is the Grand Staircase?

What is the Grand Staircase?

A A vast geologic formation
B A pile of petrified logs
C A feature of the ranger station

Zion is one of several national parks and reserves located along the Grand Staircase, an immense sequence of sedimentary rock layers. The layers of sediment, stacked like stairsteps, date back as far as 600 million years. Many layers hold fossils of long-extinct creatures.

The correct answer is A vast geologic formation.

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