J
JonClarke
Guest
Colin, you wrote:<br /><br />"How one can study all these many many images for weeks on end, as we all have done now, and not see the simple relations to massive hardened mud structures, formed from geothermal and hot mud eruptions/flows, with later reshaping and erosion by subsequent mud eruptions/flows and tidal sea action -- I will never understand. The flat sedimentry plains and wealth of serpentine and curved forms and the fluvial fans are all there to see. <br /><br />People have not the eyes to see. These landforms look nothing like mesas and buttes on Earth. The proclivity to refer to them as 'stone' is simply an effort to hold on to old ideas which one learned in one's youth. Or learned in the pre-2ooo 'Mars is a volcanic desert' 'Mars always was dead' era."<br /><br />I confess I have problems with maing sense of what you wrote.<br /><br />A mesa is a flat topped hill, a butte is a somewhat narrower flat topped hill. Both are usually developed in horizontally layered materials. In Cydonia we have many flat topped hills developed in horizontally layered materials and therefore can be legitimately be called mesas as buttes. Some are not flat topped, you may call these hills or knolls instead. But they are variants of the same geomorphic features.<br /><br />I am not sure what you mean when you say they are not made out of "stone."? Are you saying that they are not rock? The steepness of some of the slopes suggests they are, or are at the least very cohesive.<br /><br />I can't think of anyone who says that Mars was always dead. At least not in the past 34 years since Mariner 9. Maybe briefly between 1965 and 1971 when Mariners 4, 6 and 7 appeared to show a dead world, albeit one with terrain softing, crater degradation, and chaotic terrain. But nodby since Mariner 9 would hold that Mars is a dead world like the moon, with only minor modification by the wind.<br /><br />However, Mars is a volcanic desert by terrestrial standards. Volcanism is probably the dominan <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>