We don't have synonyms for keuper yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are keeper, kemper and kelper.
(n) :
A lithostratigraphic unit (a sequence of rock strata) in the subsurface of large parts of west and central Europe, consisting of dolomite, shales or claystones and evaporites that were deposited during the Middle and Late Triassic epochs (about 220 million years ago).
(n) :
A lithostratigraphic unit (a sequence of rock strata) in the subsurface of large parts of west and central Europe, consisting of dolomite, shales or claystones and evaporites that were deposited during the Middle and Late Triassic epochs (about 220 million years ago).