i call b.s. on petrified forests of mars, too. that is utterly perposterous. the rocks resemble nothing of petrified trees. <br /><br />mars is an alien world even though it is romantically earth-looking in many ways. but in just as many ways it is entirely alien. mars is a mysterious place with morphology that is barely understood. and may remain that way for centuries. <br /><br />i'm typically open to hearing whacko fringe ideas, as sometimes they have the seeds of genius even if they are half-baked or pseudoscientific --but this is a case where that does not apply. today, i am rigid and closed to the idea of petrified tree trunks on mars. <br /><br />it seems, at least to me, that mars is nearly entirely couched in a geologic, abiotic, history. with very little, if any, relevant biogenetic or fluvial mechanisms responsible for much of anything. <br /><br />if any such biogenesis exists as fossils or as a contemporary methanogen, such life may likely be very simple organisms able to subsist in very hostile and primitive conditions --if it is there at all. i would fantasize that any more complex life may not resemble anything more developed than pre-cambrian earth-based oceanic life, that which is the lower end of evolutionary complexity.