It was not a bright or splendid summer evening, though fair and soft: the haymakers were at work all along the road; and the sky, though far from cloudless, was such as promised well for the future: its blue — where blue was visible — was mild and settled, and its cloud strata high and thin.
There are no more uses of "strata" in the book.
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The candidate reaches across social strata — from millionaires to the unemployed.
Re-orientation of rock strata occurs principally due to tectonic forces.