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A mixed vertebrate eggshell assemblage from the Transylvanian Late Cretaceous
M.S. FERNÁNDEZ; C. LAURENT; G. KAISER; M. VREMIR; G. DYKE
Congreso; 11º Congreso de la Asociación Paleontologica Argentina; 2017
Asociación Paleontologica Argentina y Universidad Nacional de Río Negro
A multi-taxon nesting site from Romania has been preserved in three dimensions. This Oarda (Od) rocks reveals the earliest known examples of nesting site sharing the same nesting area in the vertebrate fossil record. Eggshell and osteological evidence mixed in a single alloc accumulation, shows that at least three other vertebrate taxa were nesting at the same site as enantiornithine birds. The Od lens was collected in pieces from the basal fluvio-paludal part of the Oarda outcrop (Maastrichtian Sebeş Formation) and is housed in the Transylvanian Museum Society, Cluj-Napoca, Romania as EME V.314. Thin-sections and SEM investigation of EME V.314 augments our initial reports by revealing the presence of four distinct eggshell structural types: (1) theropod eggshells (prismatic morphotype), (2) Gekkota (geckoid basic type); (3) enantiornithid egg; and (4) Krokolithidae (crocodyloid basic type, crocodile). With these associations in mind, we discuss a fossil accumulation from the Late Cretaceous Oarda de Jos locality (Od) in the vicinity of Sebeş City, Transylvania (western Romania) that records at least four different eggshell morphotypes in a single, very restricted micro-horizon.*Proyecto financiado por PICT 2013-1901.