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Science 12 June 1970:
Vol. 168. no. 3937, pp. 1353 - 1355
DOI: 10.1126/science.168.3937.1353
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Articles

Carbon-13 and Oxygen-18 in Dinosaur, Crocodile, and Bird Eggshells Indicate Environmental Conditions

R. E. Folinsbee 1, P. Fritz 1, H. R. Krouse 1, and A. R. Robblee 1

1 Departments of Geology, Physics, and Animal Science, University of Alberta, Edmonton 7, Alberta, Canada

We have gathered, from the nests of dinosaurs, and living and fossil birds, some evidence of the environment in which these creatures lived. However, our isotope determinations suggest it will be impossible to resolve the problem as to whether the dinosaurs were warm-or cold-blooded from the oxygen and carbon isotopes content of their shells.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)