Oblongoolithus is an oogenus of dinosaur eggs, from the Campanian Barun Goyot Formation of Mongolia. The oogenus contains one oospecies O. glaber, and is the sole described oospecies in the oofamily Oblongoolithidae.Oblongoolithus at Fossilworks.org
These eggs are small and share many characteristics with elongatoolithids and laevisoolithids, which represent the eggs of theropods. Its outer surface is smooth, contrasting with the rough ornamentation of elongatoolithids. They are small and elongated in shape, with an estimated size of . The thickness of the eggshell ranges from .
The fossils now assigned to Oblongoolithus consist of just six fragments of one egg. They were discovered in Ömnögovi Province of Mongolia by the Joint Soviet-Mongolian Expedition in the 90s.
See also List of dinosaur oogenera
References
Bibliography Carpenter, K. 1999. Eggs, Nests, and Baby Dinosaurs: A Look at Dinosaur Reproduction (Life of the Past). Indiana University Press, Bloomington, Indiana K. E. Mikhailov. 1996. New genera of fossil eggs from the Upper Cretaceous of Mongolia. Paleontological Journal 30(2):246-248