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The Baqueró Formation of Santa Cruz Province, Argentina, has proved to be rich in spore-pollen content. So far, 46 species have been determined, 10 of them being new. Three other groups of species are recognized: (1) those which are common only with Australia (and Antarctica); (2) those common with northern provinces only; and (3) those which are cosmopolitan (present in northern as well as in southern provinces). The age of the formation, judging by the whole assemblage, is Lower Cretaceous, more precisely Barremian to Aptian. No true angiosperms occur in this assemblage.