NASA rovers Perseverance and Curiosity have detected organic material in ancient sedimentary rocks in widely separated regions of Mars. ^[1] Researchers introduced SHERLOC (Structured Hypothesis-driven Exploration and Reasoning for Localization), a training-free framework that pairs a reasoning LLM with compact repository tools and self-recovery capabilities. ^[2] SHERLOC achieves 84.33% accuracy@1 on the SWE-Bench Lite benchmark and 81.27% recall@1 on the SWE-Bench Verified benchmark. ^[3] Organic material in two distant water-shaped environments suggests that carbon chemistry associated with habitability was not confined to one isolated basin. ^[4] Perseverance made its measurements in Jezero Crater, where an old river carried sediment into a lake, while Curiosity made its discoveries in Gale Crater, where streams and groundwater fed another long-lived lake system. ^[5] The findings do not show that life existed at either location because organic describes carbon-containing chemistry, not a biological origin. ^[6] Injecting SHERLOC locations and diagnostic findings into repair agents yields an average 5.95 percentage point gain in resolve rate from the best SHERLOC result per setting on SWE-Bench Verified. ^[7]