38. 0.25 Ga salt deposits preserve signatures of habitable conditions and ancient lipids. Cockell, C. S., Wilhelm, M. B. Scott, P., Wadsworth, K., Payler, S., McMahon, S., Paling, S., & Edwards, T.  Astrobiology (available online)

37. Do Extraordinary Claims Require Extraordinary Evidence? The Proper Role of Sagan’s Dictum in Astrobiology. McMahon, S. In: Smith, K.C., & Mariscal, C. (Eds.), Social and Conceptual Issues in Astrobiology. Oxford University Press, New York.


36. Earth’s earliest and deepest purported fossils may be iron-mineralized chemical gardens. McMahon, S. Proceedings of the Royal Society B: Biological Sciences 286, 20192410.

35. A laboratory for multi-century science. Cockell, C.S., Santomartino, R., McMahon, S., Reekie, P., Alberti, S.J.M.M., Phillipson, T., Russell, S. In: Astronomy & Geophysics 60, 6.26–6.28

34. Sample Collection and Return from Mars: Optimising Sample Collection Based on the Microbial Ecology of Terrestrial Volcanic Environments. Cockell, C.S., McMahon, S., Lim., D.S.S., Rummel, J., Stevens, A.H., et al. Space Science Reviews 21544.

33. Forum Reply: Petrological evidence in support of the death mask model for Ediacaran soft-bodied preservation in South Australia. Liu, A.G., McMahon, S., Matthews, J.J., Still, J., Brasier, A.T., & Marosi, D.M. Geology 47, e474.

32. Lifeless Martian samples and their significance.Cockell, C.S., McMahon, S. Nature Astronomy 3, 468-470.

31. A new frontier for palaeobiology: Earth’s vast deep biosphere. McMahon, S., & Ivarsson, M. BioEssays 41, 1900052.

30. Petrological evidence in support of the death mask model for Ediacaran soft-bodied preservation in South Australia Liu, A.G., McMahon, S., Matthews, J.J., Still, J., & Brasier, A.T. Geology 47, 215-218.


29. Reduction spheroids preserve a uranium isotope record of the ancient deep continental biosphere McMahon, S., Hood, A. vS., Parnell, J., & Bowden, S. Nature Communications 9, 4505.

28. The deep history of Earth’s biomass McMahon, S., & Parnell, J. Journal of the Geological Society 175, 716–720.

27. Exogeoconservation: Protecting geological heritage on celestial bodies Matthews, J. J., & McMahon, SActa Astronautica 149, 55–60.

26. A field guide to finding fossils on Mars McMahon, S., Bosak, T., Grotzinger, J.P., Milliken, R. E., Summons, R. E., Daye, M., Newman, S. A., Fraeman, A., Williford, K.H ., & Briggs, D. E. G.  Journal of Geophysical Research: Planets 123, 1012–1040. Top 20 most downloaded article in JGR: Planets, 2017–2018

25. Palaeobiology of latest Ediacaran phosphorites from the upper Khesen Fm., Khuvsgul Gp., northern Mongolia Anderson, R. P., McMahon, S., Macdonald, F. A., Jones, D. S., & Briggs, D. E. G. Journal of Systematic Palaeontology.

24. Demonstrating deep biosphere activity in the geological record of lake sediments, on Earth and Mars Parnell, J., McMahon, S., & Boyce, A. International Journal of Astrobiology 17, 380–385.


23. Doushantuo-type microfossils from latest Ediacaran phosphorites of northern Mongolia Anderson, R. P., Macdonald, F. A., Jones, D. S., McMahon, S., & Briggs, D. E. G. Geology 45, 1079–1082.

22. Biofilms mediate the preservation of leaf adpression fossils by clays Locatelli, E., McMahon, S., & Bilger, H. Palaios 32, 708–724. Palaios Outstanding Paper of 2017.

21. Decay of the sea anemone Metridium (Actiniaria): Implications for the preservation of soft-bodied diploblast-grade animals. McMahon, S., Tarhan, L. G., & Briggs, D. E. G. Palaios 32, 388–395.

20. Palaeobiology of the early Ediacaran Shuurgat Formation, Zavkhan Terrane, southwestern Mongolia Anderson, R. P., McMahon, S., Bold, U., Macdonald, F. A., & Briggs, D. E. G. Journal of Systematic Palaeontology 15, 947–968.

19. The Origin and Occurrence of Subaqueous Sedimentary Cracks McMahon, S., Hood, A. v S., & McIlroy, D. Geological Society of London, Special Publications 448, 285–309.


18. The aesthetic objection to terraforming Mars McMahon, S. In: Schwartz, J.S.J., & Milligan, T. (Eds.), The Ethics of Space Exploration. Springer, London.

17. Evidence for seismogenic hydrogen gas, a potential microbial energy source on Earth and Mars McMahon, S., Parnell, J., & Blamey, N. J. Astrobiology 16, 690–702.

16. Experimental evidence for inhibition of bacterial growth by clay minerals and its implications for fossil preservation McMahon, S., Anderson, R. P., Saupe, E. E., & Briggs, D. E. G. Geology 44, 867–870.

15. The Tully Monster is a Vertebrate McCoy, V. E., Saupe, E. E., Lamsdell, J. C., Tarhan, L. G., McMahon, S., Lidgard, S., Mayer, P., Whalen, C. D., Soriano, C., Finney, L., Vogt, S., Clark, E. G., Anderson, R. O., Petermann, H., Locatelli, E. R., & Briggs, D. E. G. Nature 532, 496–499.

14. Mineralogical determination in situ of a highly heterogeneous material using a miniaturized laser ablation mass spectrometer with high spatial resolution Neubeck, A., Tulej, M., Ivarsson, M., Broman, C., Riedo, A., McMahon, S., Wurz, P., & Bengston, S. (2016) . International Journal of Astrobiology 15, 133–146.

13. The role of experiments in investigating the taphonomy of exceptional preservation Briggs, D.E.G., & McMahon, S. Palaeontology 59, 1–11.

12. Physical and Chemical Controls on Habitats for Life in the Deep Subsurface Beneath Continents and Ice Parnell, J., McMahon, S. Transactions of the Royal Society of London A 374, 20140293.


11. Martin Brasier (1947-2014): AstrobiologistMcMahon, S., Cockell, C. S. International Journal of Astrobiology 14, 527–531.

10. Evidence for methane in martian meteorites.Blamey, N., Parnell, J., McMahon, S., Mark, D., Tomksinson, T., Lee, M., Shivak, J., Izawa, M., Banerjee, N., & Flemming, R. Nature Communications 6: 7399.


9. Parnell, J., McMahon, S., Blamey, N. J. F., Hutchinson, I. B., Harris, L. V., Ingley, R., Edwards, H. G. M., Lynch, E. & Feely, M. Detection of reduced carbon in a basalt analogue for martian nakhlite: a signpost to a habitat on Mars. International Journal of Astrobiology 13: 124-131.

8. Price, M., Ramkissoon, N., McMahon, S., Miljkovic, K., Parnell, J., Wozniakiewicz, P., Kearsley, A., Blamey, N., Cole, M., & Burchell, M. Limits on methane release and generation via hypervelocity impact of Martian analog materials. International Journal of Astrobiology 13: 132-140.

7. McMahon, S., Parnell, J. Weighing the deep continental biosphere. FEMS Microbiology Ecology 87: 113-120. Chief Editor’s Choice, January 2014.


6. McMahon, S., O’Malley-James, J., & Parnell, J. Circumstellar habitable zones for terrestrial deep biospheres. Planetary and Space Science 85, 312–318.

5. McMahon, S., Parnell, J., Ponicka, J., Hole, M., & Boyce, A. The habitability of vesicles in martian basalt. Astronomy & Geophysics 54, 1.17–1.21.

4. Brasier, M., Matthewman, R., McMahon, S., Kilburn, M., & Wacey, D. Pumice from the ~3,460 Ma Apex Basalt, Western Australia: a natural laboratory for the early biosphere. Precambrian Research 224, 1–10.

3.Sampling methane in basalt on Earth and Mars. McMahon, S., Parnell, J., & Blamey, N. J. F.  International Journal of Astrobiology  12, 113-122.


2. McMahon, S., Parnell, J., & Blamey, N. J. F. Sampling methane in hydrothermal minerals on Earth and Mars. International Journal of Astrobiology 11, 163-167.


1. Brasier, M.D.,  Matthewman, R., McMahon, S., & Wacey, D. Pumice as a Remarkable Substrate for the Origin of Life. Astrobiology 11, 725-735.


Conference proceedings (extended abstracts)

(Talk) McMahon, S., Bosak, T., Grotzinger, J.P., Briggs, D.E.G., Hurowitz, J., Tosca, N., Petroff, A., Summons, R.E., & Weiss, B.P. (2018) How can we look for fossils on Mars? ESA/LPI: Second International Mars Sample Return Conference (Talk, April 25–27, Berlin, 2018).

(Poster) McMahon, S. & Parnell, J. (2013) Potential for deep hydrogenotrophic life on Mars. In Proc. Lunar and Planetary Science Conf. XLIV, abstract 2870.

(Poster) McMahon, S., James, J. O., Parnell, J. (2013) Circumstellar habitable zones for deep biospheres. In Proc. Lunar and Planetary Science Conf. XLIV, abstract 2931.

(Poster) Price, M. C., Parnell, J., Wozniakiewicz, P. J., Kearsley, A. T., McMahon, S, Blamey, N. J. F. and M. J. Burchell, M. J. (2013) Gas retention in basaltic rocks following hypervelocity impact: implications for methane on Mars. In Proc. Lunar and Planetary Science Conf. XLIV, abstract 1935.

(Plenary talk) McMahon, S. (2012) Deep biospheres on Earth, Mars and beyond. ESA/ISGP Joint Life Sciences Meeting 2012, Aberdeen, UK [awaiting online release].

McMahon, S., Parnell, J. & Blamey, N. J. F. (2012). Analysis of volatile fluids in basalt: a possible source of Martian methane. In Proc. Lunar and Planetary Science Conf. XLIII, abstract 1046.

McMahon, S., Parnell, J., Burchell, M. & Blamey, N. J. F. (2012). Methane retention by rocks following simulated meteorite impacts: implications for Mars. In Proc. Lunar and Planetary Science Conf. XLIII, abstract 1040.