Unusually thick dinosaur eggshell fragments from the Spanish Late Cretaceous

2017-08-04T13:59:09Z (GMT) by Julio Company
<p>Fieldwork carried out recently in the southeastern branch of the Iberian Range (Valencia Province, Spain) has led to the collection of a large volume of dinosaur eggshell fragments of unusual thickness. These specimens, up to 4.9 mm thick, were recovered from palustrine grey marls of the upper Campanian-lower Maastrichtian Sierra Perenchiza Formation, which comprises a wetland paleoenvironment deposit. These eggshell fragments have a characteristic compactituberculate ornamentation, dinosauroid-spherulitic organisation, and exhibit a complex canaliculate respiratory system. The external tuberculate surface of the shell as well as the internal microstructure enable referral to <i>Megaloolithus</i> aff. <i>siruguei</i>, the most common megaloolithid oospecies known from the Iberian Peninsula and southern France. The biostratigraphic range of <i>M. siruguei</i> matches the temporal distribution of titanosaurid dinosaurs across the Iberian Range, tentatively considered to be potential producers.</p>