Abstract
Starting from paleoenvironmental questioning, the evidence of root zones is checked after in a section of Swedish Hettangian in Helsingborg. Within the 29 meters profile studied there are at least seven such horizons of clayey to silty, respectively sandy facies, as well as one thin coal seam. Keeping in mind a bad preservation and diagnostic problems resulting therefrom, one might consider Equisetales and Filicales to be fundamental constituents of at least three root zones. It is moreover discussed if Filicales are preceded by Equisetales within two horizons. Not interesting though root zones might be to systematic paleobotany, they prove to be paleoecological indices whenever paleoenvironments are concerned.
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