Geographic, stratigraphic and paleoenvironmental precisions about the horizons bearing pteridospermic cupules in the Jejenes Formation, Carboniferousof San Juan Province, Argentina.

The Carboniferous Jejenes Formation, has been known as a plant-bearing unit since the last century. Several studies have revealed the presence of an i mportant taphoflora; however, the precise fossiliferous sites mentioned in the original surveys remained as general references covering a wide geograp hic location. One of such sites has been discovered and is studied in detai l herein, including the sedimentary environment of the plant-bearing horizo ns. This particular locality is a relevant site because it contains abundan t pteridosperm cupules in organic attachment to vegetative organs, which ar e described for the first time in the Carboniferous of Gondwana.