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Dinosaur egg deposits in Korea

From: Ben Creisler

A new online paper:

In Sung Paik, Hyun Joo Kim & Min Huh (2012)
Dinosaur egg deposits in the Cretaceous Gyeongsang Supergroup, Korea:
Diversity and paleobiological implications.
Journal of Asian Earth Sciences (advance online publication)

The taphonomy and depositional environments of dinosaur-egg-bearing
deposits in the Cretaceous Gyeongsang Basin, Korea, are described and
their paleobiological implications are discussed in the context of
global geographic occurrences, geological ages, paleoenvironments, and
lithology. The general depositional environment of dinosaur egg
deposits in the Gyeongsang Supergroup is interpreted as dry
floodplains with a semi-arid climate and intermittent volcanic
activity. The diverse floodplain paleoenvironments include fluvial
plains with meandering rivers to alluvial plains with episodic
sheet-flooding. Both global and Korean dinosaur-egg-bearing deposits
are generally restricted to the Late Cretaceous, a phenomenon for
which two possible explanations are proposed. The first possible
explanation for the temporal limitation of dinosaur egg preservation
involves the appearance of angiosperms in the Late Jurassic, the Late
Cretaceous ecological dispersion of angiosperm trees into swamps and
floodplains, and the attendant change in herbivorous dinosaurs’ diets.
The second possible reason is related to nesting behavior in the
Cretaceous. By contrast to the temporally limited occurrence of
dinosaur eggs, paleoenvironments of nesting areas are diverse, ranging
from inland areas to coastal areas. These hypotheses may provide new
directions for the study and understanding of dinosaur egg
distribution in the context of geologic time