Past, current, and future missions to Mars are primarily motivated by the outstanding question of whether life ever existed on the red planet 1. Our results stress the importance in returning samples to Earth for conclusively addressing whether life ever existed on Mars. Our analyses by testbed instruments that are on or will be sent to Mars unveil that although the mineralogy of Red Stone matches that detected by ground-based instruments on the red planet, similarly low levels of organics will be hard, if not impossible to detect in Martian rocks depending on the instrument and technique used. We show that Red Stone samples display an important number of microorganisms with an unusual high rate of phylogenetic indeterminacy, what we refer to as “dark microbiome”, and a mix of biosignatures from extant and ancient microorganisms that can be barely detected with state-of-the-art laboratory equipment. Here we report Red Stone, a 163-100 My alluvial fan–fan delta that formed under arid conditions in the Atacama Desert, rich in hematite and mudstones containing clays such as vermiculite and smectites, and therefore geologically analogous to Mars. Press T again and it will allow you to fast-forward until morning at which point in time you will automatically sell whatever is in your keepnet and be prompted to purchase a new day's worth of travel accommodations (see 'Cost Per Day' below) allowing you to continue to fish without paying the initial Travel Cost anew.Identifying unequivocal signs of life on Mars is one of the most important objectives for sending missions to the red planet. To do this, once you have filled the keepnet, press T to advance Time past 9pm. While leveling, it is recommended that you have the largest keepnet available when traveling to a new location as you will often need to continue to fish at that location for more than one day in order to recuperate the travel costs.
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