55. D.S. McKay, E.K. Gibson, K.L. Thomas-Keprta, H. Vali, S. Romanek, S.J. Clemett, X.R.F. Chiller, C.R. Maechling, and N. Zare, “Search for Past Life on Mars: Possible Relict Biogenic Activity in Martian Meteorite ALH 84001,” Science 273:924-930, 1996.

 

56. J.W. Schopf, A.B. Kudryavtsev, D.G. Agresti, T.J. Wdowiak, and A.D. Czaja, “Laser-Raman Imagery of Earth’s Oldest Fossils,” Nature 416:73-76, 2002.

 

57. S.J. Mojzsis and T.M. Harrison, “Vestiges of a Beginning: Clues to the Emergent Biosphere Recorded in the Oldest Known Sedimentary Rocks,” Geological Society of America Today 10:1-7, 2000.

 

58. A.C. Allwood, M.R. Walter, B.S. Kamber, C.P. Marshall, and I.W. Burch, “Stromatolite Reef from the Early Archaean Era of Australia,” Nature 414:714-718, 2006.

 

59. See, for example, National Research Council, An Astrobiology Strategy for the Exploration of Mars, The National Academies Press, Washington, D.C., 2007, pp. 27-54 and 103-104.

 

60. S. Chang, “The Planetary Setting of Prebiotic Evolution,” in Early Life on Earth (S. Bengston, ed.), Columbia University Press, New York, 1994.

 

61. E.G. Nisbet and N.H. Sleep, “The Habitat and Nature of Life and Its Timing,” Nature 409:1083-1091, 2001.

 

62. M.A. Line, “The Enigma of the Origin of Life and Its Timing,” Microbiology 148:21-27, 2002.

 

63. D.S. McKay, E.K. Gibson, K.L. Thomas-Keprta, H. Vali, S. Romanek, S.J. Clemett, X.R.F. Chiller, C.R. Maechling, and N. Zare, “Search for Past Life on Mars: Possible Relict Biogenic Activity in Martian Meteorite ALH 84001,” Science 273:924-930, 1996.



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