aSupracretaceous(Geol) Lying above the chalk; Supercretaceous.
Century Dictionary and Cyclopedia
supracretaceousIn geology, overlying the Cretaceous series, or more recent than that: noting rocks, including those of the Tertiary, Post-tertiary, and recent formations or groups. Also supercretaceous.
Chambers's Twentieth Century Dictionary
adjSupracretaceoussū-pra-krē-tā′shus (geol.) denoting strata lying above the chalk.