Layers or levels (6)

I believe the answer is:

strata

I believe this is a double definition.

'layers' is the first definition.
(I know this)

'levels' is the second definition.
(I know this)

(Other definitions for strata that I've seen before include "Tiers of thicknesses" , "levels of society" , "bands" , "Layers or thicknesses of earth" , "Geological layers" .)

I've seen this clue in the Sydney Morning Herald.

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