Ancient Species -
Bacteria

Aside from cyanobacteria, bacteria do not often leave fossil records. However, under certain conditions, bacterial cells can be replaced with minerals, usually pyrite or siderite. forming replicas of the bacteria cells. Some bacteria secrete iron-coated sheaths that sometimes fossilize. One group forms tiny crystals of iron oxide (magnetite) inside their cells. These magnetite crystals, a  few hundred millionths of an meter across, have been found in 2 billion year old rocks. They are the smallest known fossils.

  

Micofossils now available (at eBay):

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