Concentration of carbon dioxide in the Late Cretaceous atmosphere

Stable carbon isotope data from Late Cretaceous (Maastrichtian) palaeosols in India are used to estimate the concentration of carbon dioxide in the Late Cretaceous atmosphere. We show that the Maastrichtian atmosphere is unlikely to have contained more than about 1300 ppm by volume of CO2.This value agrees with an independently modeled value of CO2 in the Late Cretaceous atmosphere. A low concentration of the greenhouse gas carbon dioxide in the Maastrichtian atmosphere (relative to concentrations in the earlier Cretaceous) is consistent with palaeotemperature information from terrestrial plant and marine fossils, which suggest that the global climate cooled toward the end of the Cretaceous Period.

[1]  M. E. Nelson,et al.  A Fossil Grass (Gramineae: Chloridoideae) from the Miocene with Kranz Anatomy , 1986, Science.

[2]  D. Mohabey,et al.  Stable-isotope analyses of dinosaur eggshells: Paleoenvironmental implications , 1991 .

[3]  D. Pirrie,et al.  High-paleolatitude late cretaceous paleotemperatures: New data from James Ross Island, Antarctica , 1990 .

[4]  R. Berner.  Atmospheric Carbon Dioxide Levels Over Phanerozoic Time , 1990, Science.

[5]  P. N. Shukla,et al.  Chemical profiles in K/T boundary section of Meghalaya, India: Cometary, asteroidal or volcanic , 1994 .

[6]  T. Cerling.  Use of carbon isotopes in paleosols as an indicator of the P(CO2) of the paleoatmosphere , 1992 .

[7]  J. A. Wolfe,et al.  North American nonmarine climates and vegetation during the Late Cretaceous , 1987 .

[8]  J. D. Hudson.  Palaeoatmospheres in the Phanerozoic , 1989, Journal of the Geological Society.

[9]  Thure E. Cerling,et al.  Carbon dioxide in the atmosphere; evidence from Cenozoic and Mesozoic Paleosols , 1991 .

[10]  V. Wright,et al.  Assessing the carbon dioxide content of ancient atmospheres using palaeocalcretes: theoretical and empirical contraints , 1991, Journal of the Geological Society.

[11]  Robert A. Berner,et al.  A model for atmospheric CO 2 over Phanerozoic time , 1991 .

[12]  R. Spicer,et al.  Late Cretaceous terrestrial vegetation: A near-polar temperature curve , 1988 .

[13]  R. Riding,et al.  Stable isotopic compositions of Recent freshwater cyanobacterial carbonates from the British Isles: local and regional environmental controls , 1993 .

[14]  R. Stothers.  Flood basalts and extinction events , 1993 .

[15]  L. W. Alvarez,et al.  Extraterrestrial Cause for the Cretaceous-Tertiary Extinction , 1980, Science.

[16]  P. Deines,et al.  Chapter 9 – THE ISOTOPIC COMPOSITION OF REDUCED ORGANIC CARBON , 1980 .

[17]  M. Bender,et al.  Tracers in the Sea , 1984 .

[18]  A. Sood,et al.  Palaeoenvironments of the dinosaur-bearing Lameta Beds (Maastrichtian), Narmada Valley, Central India , 1995 .