The Sunjiawan Formation () is a geological

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...

in Liaoning, China, with strata possibly dating back to the early

Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...

, specifically the

Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the s ...

.Xi et al., 2018 Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel et al., 2004, pp.563-570 It forms part of the same geological sequence as the older and underlying

Yixian Formation The Yixian Formation (; formerly transcribed as Yihsien Formation) is a geological formation in Jinzhou, Liaoning, People's Republic of China, that spans the late Barremian and early Aptian stages of the Early Cretaceous. It is known for its ex ...

and

Jiufotang Formation The Jiufotang Formation ( Chinese: 九佛堂组, pinyin: ''jiǔfótáng zǔ'') is an Early Cretaceous geological formation in Chaoyang, Liaoning which has yielded fossils of feathered dinosaurs, primitive birds, pterosaurs, and other organisms (see ...

. It primarily consists of variegated conglomerates with rare intercalations of thin bedded sandstones, siltstones and mudstones.Wang et al., 2015

Dinosaurs

Remains of the following dinosaurs have been found in the formation:

Ornithischians

Remains of the following dinosaurs have been found in the formation:

References

Bibliography

* * * * * {{doi, 10.1111/j.1755-6724.2007.tb01010.x

Dinosaurs

Ornithischians

See also

References

Bibliography

Further reading