Abstract
The Pedra de Fogo Formation, of Permian age, which is situated within the Parnaiba Basin, is well know for its content of fossil trunks, principally of the Genus Psaronius. However, in recent years, other genera have been found with some frequency. The occurrence of 33 permineralised fossil trunks, preserved in growth position on the right hand margin of the poti River, in the city of Teresina, Piaui, is reported here. This paper details the area of occurrence of the fossil trunks and describes briefly the characteristics of the sedimentary facies, which suggest a transitional (marine-continental) depositional environment. One wood specimen, belonging to a new genus and a new species (Teresinoxylon euzebioi Mussa) is described; it shows close affinity with the Cycadoxyleae. A probable Lower Middle Permian age can be assigned to the specimens from this important and rare fossiliferous site and it is requested here that the authorities act promptly to ensure its preservation.
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