''Ovaloolithus'' is an

oogenus Egg fossils are the fossilized remains of eggs laid by ancient animals. As evidence of the physiological processes of an animal, egg fossils are considered a type of trace fossil. Under rare circumstances a fossil egg may preserve the remains ...

dinosaur egg Dinosaur eggs are the organic vessels in which a dinosaurs, dinosaur embryo develops. When the first scientifically documented remains of non-avian dinosaurs were being described in England during the 1820s, it was presumed that dinosaurs had la ...

. Eggs of the genus have been found in

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

Mongolia Mongolia is a landlocked country in East Asia, bordered by Russia to the north and China to the south and southeast. It covers an area of , with a population of 3.5 million, making it the world's List of countries and dependencies by po ...

and

Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...

Species

Oospecies attributed to this genus include:''Ovaloolithus''
in the

Paleobiology Database The Paleobiology Database (PBDB) is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database originated in the NCEAS-funded Phanerozoic Marine Pale ...

* ''O. chinkangkouensis'' -

Cenomanian The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age (geology), age of the Late Cretaceous epoch (geology), Epoch or the lowest stage (stratigraphy), stage of the Upper Cretace ...

Santonian The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya ( million years ago) and 83.6 ± 0.7 m ...

Bayan Shireh Formation The Bayanshiree Formation (also known as Baynshiree/Baynshire, Baynshirenskaya Svita, Baysheen Shireh, or Bayan Shireh) is a geological formation in Mongolia, that dates to the Cretaceous period. It was first described and established by Vasilie ...

, Mongolia,

Campanian The Campanian is the fifth of six ages of the Late Cretaceous epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campa ...

Jingangkou Formation (

Wangshi Group The Wangshi Group () is a geological Group in Shandong, China whose strata date back to the Campanian stage of the Late Cretaceous, approximately . Dinosaur remains are among the fossils that have been recovered from the group.Weishampel et al., 2 ...

), China * ''O. dinornithoides'' -

Maastrichtian The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ...

Nemegt Formation The Nemegt Formation (also known as Nemegtskaya Svita) is a geological formation in the Gobi Desert of Mongolia, dating to the Late Cretaceous. The formation consists of river channel sediments and contains fossils of fish, turtles, crocodilians ...

, Mongolia * ''O. laminadermus'' -

Jingangkou Formation (

), China * ''O. tenuisus'' -

(

Lancian The Lancian was a North American faunal stage of the Late Cretaceous. It was the final stage of the Cretaceous period in North America, lasting from approximately 70.6 to 66 million years ago. Geology Terrestrial sedimentary strata from the Judit ...

)

North Horn Formation The North Horn Formation is a widespread non-marine sedimentary unit with extensive outcrops exposed in central and eastern Utah. The formation locally exceeds in thickness and is characterized by fluvial, Lacustrine plain, lacustrine, and floo ...

, Utah * ''O. turpanensis'' -

Subashi Formation The Subashi Formation () is a Late Cretaceous (Campanian to Maastrichtian)Xi et al., 2018 formation from the Xinjiang Autonomous Region of western China.Maastrichtian The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ...

(

)

, Utah * ''Ovaloolithus sp.'' -

Coniacian The Coniacian is an age or stage in the geologic timescale. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series and spans the time between 89.8 ± 1 Ma and 86.3 ± 0.7 Ma (million years ago). The Coniacian is preceded by ...

Zhaoying Formation,

Turonian The Turonian is, in the International Commission on Stratigraphy, ICS' geologic timescale, the second age (geology), age in the Late Cretaceous epoch (geology), Epoch, or a stage (stratigraphy), stage in the Upper Cretaceous series (stratigraphy), ...

Chichengshan Formation ( Tiantai Group) and

Majiacun Formation The Majiacun Formation is a Santonian to Coniacian geologic formation in China.List of dinosaur oogenera Egg fossils are the fossilized remains of eggs laid by ancient animals. As evidence of the physiological processes of an animal, egg fossils are considered a type of trace fossil. Under rare circumstances a fossil egg may preserve the remains of t ...

References

* J.-L. Zhang, Q. Wang, S.-X. Jiang, X. Cheng, N. Li, R. Qiu, X.-J. Zhang and Z.-L. Wang. 2017. Review of historical and current research on the Late Cretaceous dinosaurs and dinosaur eggs from Laiyang, Shandong. Vertebrata PalAsiatica 55(2):187-200 * Z. Zhao, S. Zhang, Q. Wang and X. Wang. 2013. Dinosaur diversity during the transition between the middle and late parts of the Late Cretaceous in eastern Shandong Province, China: Evidence from dinosaur eggshells. Chinese Science Bulletin 58(36):4663-4669 * X.-l. Wang, Q. Wang, S.-x. Jiang, X. Cheng, J.-l. Zhang, Z.-k. Zhao, and Y.-g. Jiang. 2012. Dinosaur egg faunas of the Upper Cretaceous terrestrial red beds of China and their stratigraphical significance. Journal of Stratigraphy 36(2):400-416 * S.-K. Zhang and Q. Wang. 2010. new species of ovaloolithids from Turpan Basin in Xinjiang, China Vertebrata PalAsiatica 48(1):71-75 * X. Liang, S. Wen, D. Yang, S. Zhou, and S. Wu. 2009. Dinosaur eggs and dinosaur egg-bearing deposits (Upper Cretaceous) of Henan Province, China: Occurrences, palaeoenvironments, taphonomy and preservation. Progress in Natural Science 19(11):1587-1601 * K. E. Mikhailov. 2000. Eggs and eggshells of dinosaurs and birds from the Cretaceous of Mongolia. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), The Age of Dinosaurs in Russia and Mongolia 560-572 * Carpenter, K. 1999. Eggs, Nests, and Baby Dinosaurs: A Look at Dinosaur Reproduction (Life of the Past). Indiana University Press, Bloomington, Indiana * X. Yu. 1998. haracteristics of dinosaur fossils from southern Anhui and their significance for stratigraphic position Regional Geology of China 17(3):278-284 * Y. Li, Y. Liu, X. Chen and G. Zhao. 1996. Dinosaurian Embryo II: Young Dinosaur-bones in ''Ovaloolithus''. Earth Science - Journal of China University of Geosciences 21(6):608-610 * Z. Zhao. 1979. dvances in the study of fossil dinosaur eggs in our country Mesozoic and Cenozoic red beds of South China; selected papers from the field conference on the South China Cretaceous-Early Tertiary red beds. Science Press, Beijing 330-340 * T.-k. Chao and T.-k. Chiang. 1974. Microscopic studies on the dinosaurian egg-shells from Laiyang, Shanting province. Scientia Sinica 17(1):73-90 * C.-C. Young. 1965. ossil eggs from Nanshiung, Kwangtung and Kanchou, Kiangsi Vertebrata PalAsiatica 9(2):141-170 * C.-C. Young. 1954. Fossil reptilian eggs from Laiyang, Shantung, China. Scientia Sinica 3(4):505-522 Dinosaur reproduction Cretaceous China Fossils of China Cretaceous Mongolia Fossils of Mongolia Cretaceous Utah Paleontology in Utah Fossil parataxa described in 1979 {{eggshell-stub

Species

References

Further reading