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The eggs were preserved standing up, vertically and obliquely in siltstone. Eggshells are very thin and smooth on the outer surface. The thickness of the eggshell is between 0.6 and 0.9 mm. The eggs are 105– 116 mm long and 36–48 mm wide. Possibly Prismatoolithus gebiensis Zhao & Li, 1993. Prismatoolithus eggs likely belonged to troodontids. Lit.: Xinquan Liang, Shunv Wen, Dongsheng Yang, Shiquan Zhou, Shichong Wu (2009) Dinosaur eggs and dinosaur egg-bearing deposits (Upper Cretaceous) of Henan Province, China: Occurrences, palaeoenvironments, taphonomy and preservation
The Advanced Dinosaur Egg Guide Please share this with those who have egg questions. When possible, technical terms were avoided or defined. Every effort has been made to ensure accuracy, but it is always important to do your own research. This guide is merely a snapshot of information taken from many scientific publications. I am not an expert on eggs, rather I just love sharing what little I have learned over the years, what science has learned over the years. For an overview on how to spot a fossilized dinosaur egg and the sizes of eggs, see the basic guide:
The paper describe a diverse dinosaur eggshell assemblage from the St. Mary River Formation of southern Alberta. Its paywalled but presented here to show others that it exists. Three theropod eggshell types (Continuoolithus cf. C. canadensis, Montanoolithus cf. M. strongorum, and Prismatoolithus cf. P. levis) and one ornithopod (Spheroolithus cf. S. albertensis), are reported from Albertan exposures of the St. Mary River Formation. Paywalled http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2017-0195#.WnjKE66nHIV @HamptonsDoc @-Andy-