Sulphur-loving bacteria " are still common today , " said brasier .

嗜硫菌“在如今也很常见。”

Some experts are adamant that the world 's oldest fossils are stromatolites , which have existed for 3.5 billion years , but professor martin brasier of the university of oxford said they could have been formed through chemical processes .

有的专家很坚定的认为，叠层岩是最古老的化石，已存在了35亿年。但是，牛津大学的martinbrasier教授认为，这些化石可以通过化学过程形成