Systematic descriptions and illustrations of the best preserved angiosperm pollen
grains (Monocotyledonae or Liliopsida: n= 7 and Dicotyledonae or Magnoliopsida: n=
41) recovered from Cuayuca Formation (late Eocene-early Oligocene), Puebla State,
Mexico are provided, some of them of chronostratigraphic importance (Aglaoreidia
pristina, Armeria, Bombacacidites, Corsinipollenites, Eucommia, Favitricolporites,
Intratriporopollenites, Lymingtonia, Magnaperiporites, Malvacipollis spinulosa, Margocolporites
aff. vanwijhei, Momipites coryloides, Momipites tenuipolus, Mutisiapollis,
Ranunculacidites operculatus, and Thomsonipollis sabinetownensis). Taxa identified
from the Cuayuca Formation suggest local semiarid vegetation such as tropical deciduous
forest, chaparral, grassland, and arid tropical scrub, in which angiosperms are
one of the main representatives. Nevertheless, temperate taxa from Pinus forest and
cloud forest were also registered from regional vegetation. It is noticeable that at the
present time, such taxa are well represented in the vegetation of the Balsas River
Basin, which would suggest the existence of this type of flora in the Cuayuca region
since the Oligocene.Fil: Ramirez Arriaga, Elia. Universidad Nacional Autónoma de México. Instituto de Geología. Departamento de Paleontología; MéxicoFil: Pramparo, Mercedes Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Martínez Hernández, Enrique. Universidad Nacional Autónoma de México. Instituto de Geología. Departamento de Paleontología; Méxic
