We don't have synonyms for turonian yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are Turanian, huronian and tironian.
(n) :
(geology) The second age in the Late Cretaceous epoch, or a stage in the Upper Cretaceous series, spanning the time between 93.5 ± 0.8 Ma and 89.3 ± 1 Ma (million years ago), preceded by the Cenomanian stage and underlying the Coniacian stage.
(n) :
(geology) The second age in the Late Cretaceous epoch, or a stage in the Upper Cretaceous series, spanning the time between 93.5 ± 0.8 Ma and 89.3 ± 1 Ma (million years ago), preceded by the Cenomanian stage and underlying the Coniacian stage.