Earth’s oldest stromatolites and the seek for life on Mars

The earliest morphological traces of life on Earth are sometimes extremely controversial, each as a result of non-biological processes can produce comparatively related buildings and since such fossils have typically been subjected to superior alteration and metamorphism. Stromatolites, layered organo-sedimentary buildings reflecting complicated interplays between microbial communities and their setting, have lengthy been thought-about key macrofossils for all times detection in historic sedimentary rocks; nevertheless, the organic origin of historic stromatolites has continuously been criticized.