Recent news that fossils have been found in a rock from Mars is an erroneous report. Rocks are found in Antarctica that obviously came from elsewhere.
Some are classical iron meteorites; the others are assumed to be stony meteorites. The news reports tell of finding evidence of microbial fossil life in one of these specimens. The interpretation is that this was a rock that was dislodged from Mars by meteorite impact and that it fell to Earth, landing in Antarctica.Uh-uh. Meteorites impacting Earth scatter debris as well as those impacting Mars. The subject specimen is thousands to millions of times more likely to be debris thrown out from a terrestrial meteorite impact.
"Yours truly" is a skeptical, retired chemist holding a doctorate degree.