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Science 31 March 1989:
Vol. 243. no. 4899, pp. 1711 - 1713
DOI: 10.1126/science.243.4899.1711
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Articles

Upper Jurassic Dinosaur Egg from Utah

KARL F. HIRSCH 1, KENNETH L. STADTMAN 2, WADE E. MILLER 2, and JAMES H. MADSEN JR.

1 University of Colorado Museum, Campus Box 218, Boulder, CO 80309.
2 Geology Department, Brigham Young University, Provo, UT 84602.

The Upper Jurassic egg described here is the first known egg from the 100-million-year gap in the fossil record between Lower Jurassic (South Africa) and upper Lower Cretaceous (Utah). The discovery of the egg, which was found mixed in with thousands of dinosaur bones rather than in a nest, the pathological multilayering of the eggshell as found in modern and fossil reptilians, and the pliable condition of the eggshell at the time of burial indicate an oviducal retention of the egg at the time of burial.

Submitted on September 27, 1988
Accepted on February 6, 1989


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