Researchers at Curtin University have uncovered that anaerobic bacteria significantly contribute to the preservation of fossils, using the 183-million-year-old ichthyosaur fossil as a key example. Unlike traditional beliefs that emphasized low-oxygen environments for fossil survival, this study shows that microbial processes are vital. The decomposition of the ichthyosaur led to the formation of sulfide minerals, which strengthened its bones and allowed for three-dimensional preservation. This phenomenon has been observed in other fossils, indicating a common role for microbes in fossilization. The implications extend beyond Earth, as understanding these microbial processes could enhance the search for life on Mars, where similar conditions exist. This research redefines how scientists view fossils, emphasizing the interplay between biological and environmental factors post-mortem and opening new avenues for exploration in paleontology and astrobiology.