Evolution of the Martian Atmosphere
Tales from a Martian rock: New chemical analysis of
ancient Martian meteorite provides clues to planet's
history of habitability, University of California,
San Diego, Science Daily Dec. 22, 2014
http://www.sciencedaily.com/releases/2014/12/141222165037.htm
http://ucsdnews.ucsd.edu/pressrelease/tales_from_a_martian_rock
http://www.techtimes.com/articles/22785/20141223/martian-rock-unveils-secrets-about-water-on-early-mars.htm
The paper is:
Shaheen, R., P. B. Niles, K. Chong, C. M. Corrigan,
and M. H. Thiemens, 2014, Carbonate formation
events in ALH 84001 trace the evolution of the Martian
atmosphere. PNAS, Dec. 22, 2014
http://www.pnas.org/content/early/2014/12/17/1315615112
Yours,
Paul H.