I mark eras without clocks, recording change through layers hidden in plain sight. What am I?

Category: Knowledge · Difficulty: expert

Hint: Think about earth’s records written in layers.

Answer

A geological sedimentary strata

Explanation

Sedimentary strata preserve Earth's history in rock layers over time, distinct from human records or astronomical data.

This is a expert knowledge riddle — one of the harder riddles here. The answer is A geological sedimentary strata.

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