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Upper jurassic dinosaur egg from utah.

K F Hirsch, K L Stadtman, W E Miller

    Science (New York, N.Y.)
    |March 31, 1989
    PubMed
    Summary
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    This study describes a unique Upper Jurassic dinosaur egg, filling a 100-million-year fossil gap. Its condition suggests the egg was retained within the oviduct at the time of burial.

    Area of Science:

    • Paleontology
    • Oology
    • Vertebrate Paleontology

    Background:

    • The fossil record presents a significant 100-million-year gap in dinosaur eggs between the Lower Jurassic and upper Lower Cretaceous periods.
    • Dinosaur nests and eggs provide crucial insights into reproductive strategies and paleoecology.

    Purpose of the Study:

    • To describe a newly discovered Upper Jurassic dinosaur egg.
    • To investigate the taphonomic and pathological conditions of the eggshell.
    • To infer the egg's depositional environment and reproductive history.

    Main Methods:

    • Paleontological excavation and analysis.
    • Comparative analysis of eggshell microstructure with modern and fossil reptiles.
    • Taphonomic assessment of the egg's depositional context.

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    Main Results:

    • The discovery of the first known Upper Jurassic dinosaur egg, bridging a major gap in the fossil record.
    • Pathological multilayering of the eggshell, similar to modern and fossil reptiles.
    • Pliable eggshell condition at burial, indicating incomplete fossilization.

    Conclusions:

    • The egg's condition strongly suggests oviducal retention at the time of burial.
    • This finding offers new insights into dinosaur reproductive behaviors and the challenges of fossilization.
    • The specimen represents a critical piece of evidence for understanding dinosaurian oviducal retention.