K.L. Buxbaum M.A. Meyer N. Barlow W. Boynton B. Clark J. Deming P.T. Doran K. Edgett S. Hancock J. Head M. Hecht V. Hipkin T. Kieft R. Mancinelli E. McDonald C. McKay M. Mellon H. Newsom G. Ori D. Paige A.C. Schuerger M. Sogin J.A. Spry A. Steele K. Tanaka M. Voytek D.W. Beaty 2006 In summary, within the upper 5 m most of Mars is either too cold or too dry to support the propagation of terrestrial life. However, there are regions that are in disequilibrium, naturally or induced, and could be classified as "special" or, if enough uncertainty exist, could not be declared as "non-special." ?? Mary Ann Liebert, Inc. application/pdf 10.1089/ast.2006.6.677 en Findings of the Mars Special Regions Science Analysis Group article