The Silurian Hypothesis
improve the constraints on the hypothesis so that in future we
may be better placed to answer our title question.
Acknowledgments. No funding has been provided nor sought for this study.
We thank Susan Kidwell for being generous with her time and helpful discus-
sions, David Naafs and Stuart Robinson for help and pointers to data for OAE1a
and Chris Reinhard for his thoughtful review. The GISTEMP data in Fig. 1(a)
were from https://data.giss.nasa.gov/gistemp (accessed Jul 15 2017).
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