Timing of Early Cretaceous angiosperm diversification and possible links to major paleoenvironmental change

By U. Heimhofer, P. Hochuli, Stefan Burla, J. Dinis, H. Weissert. 2005

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Monetianthus mirus gen. et sp. nov., a Nymphaealean Flower from the Early Cretaceous of Portugal (2009, background): “4.10; Bryant and Moulton 2002, 2004; Huson and Bryant 2006).”
Early evolution of angiosperm pollen as inferred from molecular and morphological phylogenetic analyses (2005, background): “…fact that a putatively nymphaealian flower described by Friis et al. (2001) from Portugal (considered Barremian-Aptian, but redated as early Albian by Heimhofer et al. 2005) had reticulate monosulcate pollen raises the possibility that the closed tectum of the living basal lines is also derived.”
Timing of early angiosperm radiation: recalibrating the classical succession (2006, background): “…and palynological studies of upper Lower Cretaceous deposits in southern Portugal (Luz section, Algarve Basin) and southwestern Portugal (Cresmina section, Lusitanian Basin) provide angiosperm pollen records of unrivalled completeness and stratigraphic precision (Heimhofer et al. 2005, 2006).”
Integrating Early Cretaceous Fossils into the Phylogeny of Living Angiosperms: ANITA Lines and Relatives of Chloranthaceae (2014, background): “Pennipollis also appears above the base of the Aptian in Portuguese marine sections (Heimhofer et al. 2005, 2007).”