Schopf J W, Barghoorn E S, Maser M D, Gordon R O
Science. 1965 Sep 17;149(3690):1365-7. doi: 10.1126/science.149.3690.1365.
Occurrence of well-preserved rod-shaped and coccoid bacteria in the Precambrian Gunflint chert (1.9 x 10(9) years old) has been demonstrated by electron microscopy. This appears to be the oldest definite occurrence of bacteria in the fossil record. The organisms are morphologically comparable with certain modern iron bacteria.
通过电子显微镜已证实，在距今19亿年的前寒武纪冈弗林特燧石中存在保存完好的杆状和球状细菌。这似乎是化石记录中最古老的确切细菌存在证据。这些生物在形态上与某些现代铁细菌相似。
