superstratum
noun
su·per·stra·tum
ˈsü-pər-ˌstrā-təm
-ˌstra-;
ˌsü-pər-ˈstrā-
-ˈstra-
plural superstrata
ˈsü-pər-ˌstrā-tə
-ˌstra-;
ˌsü-pər-ˈstrā-,
-ˈstra-
: an overlying stratum or layer
The superstratum of timidity which often overlies those who are daring and defiant at heart had been passed through …—Thomas Hardy
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Merriam-Webster unabridged
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