Abstract

The San Gregorio Formation (Late Oligocene-Early Miocene) is part of the Paleogene and Neogene stratigraphic sequence in La Purísima region, Baja California Sur, Mexico. A borehole from this formation was analyzed with the aim of contributing continental and marine palynomorphs. This paper presents the results concerning to the continental palynomorphs, belonging to bryophyte and pteridophyte spores group. One bryophyte and eight pteridophyte spores were identified to genus level: cf. Camarazonosporites, Cicatricosisporites, Deltoidospora, Granulatisporites, Leptolepidites, Lycopodiacidites, Stereisporites, Undulatisporites and Polypodiisporites. One pteridophyte spore was identified to species level —Lusatisporis dettmannae—, which was the most abundant. We present systematic descriptions of the taxa recorded. These spores are associated to the Cloud Forest vegetation type.