Definition of "substrata" []

• Plural form of substratum. (noun)

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• "Moreover, the two very compact mortar layers we found underneath the erosion layers on top and in between several enormous rubble blocks could be identified as the substrata of the original floor level, similar to those of dining Room XXII."
• "More important is what kind of substrata you are built on."
• "Tell me, Moisheh, how many "Red Necked Americans" spewing anti-semitic filth have you encountered in your town or travels that are of sufficient number to warrant your disparaging an entire substrata of U.S. culture so heedlessly."