''Spheroolithus'' is an oogenus of

dinosaur egg Dinosaur eggs are the organic vessels in which a 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 laid eggs be ...

.Wang Q, Wang X L, Zhao Z K, and Jiang Y G. (2012).
A new oofamily of dinosaur egg from the Upper Cretaceous of Tiantai Basin, Zhejiang Province, and its mechanism of eggshell formation
Chinese Science Bulletin. 57: 3740-3747. doi: 10.1007/s11434-012-5353-2

Oospecies

The following species are described:''Spheroolithus''
in the

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

* ''Paraspheroolithus sanwangbacunensis'' * ''Paraspheroolithus yangchengensis'' * ''Spheroolithus albertensis'' * ''Spheroolithus choteauensis'' * ''Spheroolithus europaeus'' * ''Spheroolithus irenensis'' * ''Spheroolithus jincunensis'' * ''Spheroolithus maiasauroides'' * ''Spheroolithus megadermus'' * ''Spheroolithus spheroides'' * ''Spheroolithus tenuicorticus''

Distribution

Fossils of the oogenus were found in: * Dinosaur Park and Oldman Formations, Alberta, Canada * China *

Sasayama Group , formerly known as , is a city in the central eastern part of Hyōgo Prefecture, Japan. , the city had an estimated population of 40,050 in 17523 households and a population density of 110 persons per km2. The total area of the city is Geograph ...

, Japan *

Cerro del Pueblo Formation The Cerro del Pueblo Formation is a geological Formation (geology), formation in Coahuila, Mexico whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel et al., ...

(

Difunta Group The Difunta Group is a Group (geology), geologic group in Mexico. It preserves fossils dating back to the Cretaceous Period (geology), period. See also * List of fossiliferous stratigraphic units in Mexico External links

* Geologic ...

), Mexico * Nemegt & Bayan Shireh Formations, Mongolia *

La Posa Formation The Tremp Formation ( es, Formación de Tremp, ca, Formació de Tremp), alternatively described as Tremp Group ( es, Grupo Tremp), is a geological formation in the comarca Pallars Jussà, Lleida, Spain. The formation is restricted to the Tr ...

(

Tremp Group The Tremp Formation ( es, Formación de Tremp, ca, Formació de Tremp), alternatively described as Tremp Group ( es, Grupo Tremp), is a geological formation in the comarca Pallars Jussà, Lleida, Spain. The formation is restricted to the Trem ...

), Spain *

Two Medicine Formation The Two Medicine Formation is a geological formation, or rock body, in northwestern Montana and southern Alberta that was deposited between and (million years ago), during Campanian (Late Cretaceous) time. It crops out to the east of the Rocky M ...

, Montana and

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, and floodplain dominated s ...

, Utah, United States

Gallery

Spheroolithidae.jpg, ''Spheroolithus'' sp. eggs Fossil Dinosaur Eggs- Paraspheroolithus sp.jpg, ''Paraspheroolithus'' eggs in Henan Geological Museum

References

Bibliography

* Carpenter, K. 1999. Eggs, Nests, and Baby Dinosaurs: A Look at Dinosaur Reproduction (Life of the Past). Indiana University Press, Bloomington, Indiana * 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 Dinosaur reproduction Late Cretaceous dinosaurs Milk River Formation Paleontology in Alberta Paleontology in Montana Cretaceous geology of Utah Paleontology in Utah Cretaceous China Fossils of China Cretaceous Japan Fossils of Japan Cretaceous Mongolia Fossils of Mongolia Cretaceous Spain Fossils of Spain Tremp Formation Fossil parataxa described in 1979 {{eggshell-stub