The Ichthyosaur has been found in many geological formations like the late Tithonian era Agardhfjellet Formation and the early Bajocian Los Molles Formation.
Agardhfjellet Formation late Tithonian Los Molles Formation early Bajocian Antimonio Formation Besano Formation Blue Lias Clearwater Formation Favret Formation (Fossil Hill Member) Franciscan Formation 
