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Science 18 December 1998:
Vol. 282. no. 5397, pp. 2241 - 2243
DOI: 10.1126/science.282.5397.2241
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Reports
Evidence for Extreme Climatic Warmth from Late Cretaceous Arctic Vertebrates
J. A. Tarduno,
*
D. B. Brinkman,
P. R. Renne,
R. D. Cottrell,
H. Scher,
P. Castillo
A Late Cretaceous (92 to 86 million years ago) vertebrate
assemblage from the high Canadian Arctic (Axel Heiberg Island) implies that polar climates were warm (mean annual temperature exceeding 14°C) rather than near freezing. The assemblage includes large (2.4 meters long) champsosaurs, which are extinct crocodilelike reptiles.
Magmatism at six large igneous provinces at this time suggests that
volcanic carbon dioxide emissions helped cause the global warmth.
J. A. Tarduno, R. D. Cottrell, H. Scher, Department of
Earth and Environmental Sciences, University of Rochester, Rochester,
NY, 14627, USA. D. B. Brinkman, Royal Tyrrell Museum of
Palaeontology, Drumheller, Alberta, TOJ OYO, Canada. P. R. Renne,
Berkeley Geochronology Center, Berkeley, CA 94709, USA. P. Castillo, Geological Research Division, Scripps Institution of
Oceanography, La Jolla, CA 92093-0220, USA.
*
To whom correspondence should be addressed. E-mail:
john{at}earth.rochester.edu
Read the Full Text
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