 Seilacher published papers on fossil "Lagerstätten", including one of 1985 that proposed a widely accepted scheme for their classification; indeed, much of his work has been concerned with preservation and taphonomy in general.His most controversial contributions were in his work on the Ediacaran assemblages, which he and Friedrich Pflüger (1994) suggested, based on their constructional morphology, to be pneu structures unrelated to modern metazoans.While this view has been steadily opposed by many workers, it gained some ground as the affinities of many of these organisms have remained resistant to analysis.