DESOJO Julia Brenda
Palaeobotany and palynology of coprolites from the Late Triassic Chañares Formation of Argentina: implications for vegetation provinces and the diet of dicynodonts
PEREZ LOINAZE, V.S.; VERA, E.I.; FIORELLI, L.E.; DESOJO, J.B.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2018
The early Late Triassic Chañares Formation of Argentina contains one of the richest tetrapod-bearing assemblages of this age worldwide and is important for understanding the origin and early radiation of suchians, dinosauromorphs, and mammaliaforms. Here, we describe the fabric and microfossil content of herbivore coprolites produced by large kannemeyeriiform dicynodonts. Identiﬁed inclusions are dominated by fragmentary plant debris (wood, cuticles) with minor palynomorphs, the latter being of special signiﬁcance as they represent the ﬁrstpalynologicalassemblageobtainedfortheformation.Thepalynological assemblage,whichisdominated by bisaccate pollen grains, Alisporites and Platysaccus (Umkomasiales=Corystospermales), and minor striate pollen grains and fern spores, is characteristic of the Ipswich Phytogeographic Subprovince. Also present are Ovalipollis and Ellipsovelatisporites, which are typically absent in this phytogeographic subprovince (being characteristic elements of the Onslow Subprovince), but have been reported in the younger Ischigualasto Formation from the same basin. A statistical analysis of Triassic palynoﬂoras across Gondwana results in a grouping containing the Ischigualasto and Chañares formations, with assemblages of East Antarctica, which together comprise a subprovince that is transitional between Ipswich and Onslow ﬂoras. The paleobotanical and palynological content of the coprolites also sheds light on the feeding behaviour of dicynodont producers, suggesting low-feeding habits and non-strict selectivity of the food source.