Crossword Genius

Layers of rock in geology (6)

Ross

I believe the answer is:

strata

(Other definitions for strata that I've seen before include "Layers as of rock in the earth's crust" , "Layers of sedimentary rock" , "Layers into which rocks are divided" , "Levels, grades or social classes" , "Layers of rock on earth's surface" .)

I've seen this clue in The Times.
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