Crossword Genius

Parallel layers of material arranged one on top of another (6)

Ross

I believe the answer is:

strata

(Other definitions for strata that I've seen before include "Layers of rock on earth's surface" , "Tiers of thicknesses" , "Parallel layers" , "Layers of sedimentary rock" , "Layers into which rocks are divided" .)

I've seen this clue in The Guardian.
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