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Rocky beds (6)

Ross

I believe the answer is:

strata

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'beds' is the definition.
(I have seen 'hard beds' mean 'strata' so perhaps 'beds' could also mean 'strata')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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