O. Aharonson R. E. Arvidson J.F. Bell III P. R. Christensen B. C. Clark J.A. Crisp W. Farrand T. Glotch M.P. Golombek J. Grant J. Grotzinger Kenneth E. Herkenhoff J. R. Johnson B.L. Jolliff A.H. Knoll S. M. McLennan H.Y. McSween Johnnie N. Moore J. W. Rice Jr. N. Tosca S. W. Squyres 2006 <p><span>The Mars Exploration Rover Opportunity discovered sulphate-rich sedimentary rocks at Meridiani Planum on Mars, which are interpreted by McCollom and Hynek</span><span>&nbsp;as altered volcanic rocks. However, their conclusions are derived from an incorrect representation of our depositional model</span><span>, which is upheld by more recent Rover data</span><span>. We contend that all the available data still support an aeolian and aqueous sedimentary origin for Meridiani bedrock.</span></p> application/pdf 10.1038/nature05212 en Nature Bedrock formation at Meridiani Planum article