Regularity of Palaeogene hyperthermals inconsistent with a temperature threshold for carbon release

Sandra Kirtland Turner (a,b), Philip F. Sexton (c), Chris D. Charles (b) & Richard D. Norris (b)
(a) School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK. E-mail: ggxsk@bristol.ac.uk. (b) Scripps Institution of Oceanography, UC San Diego, La Jolla, CA 92093-0244, USA. (c) Centre for Earth, Planetary, Space & Astronomical Research, The Open University, Milton Keynes MK7 6AA, UK.