Adpressed tree-fern trunks from the Early Pennsylvanian Joggins Formation of Nova Scotia

Tree-fern trunks are among the rarest plant fossils in the Early Pennsylvanian Joggins Formation, with only three specimens recorded, all of which are assigned to Artisophyton. Based on trunk dimensions, these fossils are remains of small trees a few metres high. The facies context is known for only one specimen; this tree grew on a well drained, seasonally dry alluvial plain. Resume Les troncs de fougere arborescente figurent parmi les fossiles vegetaux les plus rares a l’interieur de la Formation du Pennsylvanien precoce de Joggins : on y a seulement releve trois specimens, tous classes parmi les Artisophytons. Les dimensions des troncs signalent que ces fossiles constituent des vestiges de petits arbres de quelques metres de hauteur. On ne connait le contexte du facies que dans le cas d’un specimen : l’arbre en question a grandi dans une pleine alluviale seche en certaines saisons et bien drainee.