Czaja Precambrian Paleobiology Lab
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Stromatolite Lab

Images of stromatolites for Earth's Early Biosphere lab
(Hover over images to see a caption and click on images to enlarge)

Sample 1: Microbial laminite (stratiform stromatolite), Gamohaan Formation, South Africa, 2.5 billion years old. Sample composed of black chert, some gray carbonate. Voids are where carbonates weathered out.


Sample 2: Microbial laminite (stratiform stromatolite), Gamohaan Formation, South Africa, 2.5 billion years old. Sample composed of carbonate. Bent and distorted layers indicate flexibility of mat layers in life.


Sample 3: Microbial laminite (stratiform stromatolite), Fortescue Group, Australia, 2.7 billion years old. Sample composed of carbonate. Note the wavy lamina.


Sample 4: Domal Stromatolite, Gamohaan Formation, South Africa, 2.5 billion years old. Composed of carbonate.


Sample 5a: ​Domal stromatolites (small), Gamohaan Formation, South Africa, 2.5 billion years old. Sample composed of black chert. Voids are where carbonates weathered out.


Sample 5b: Domal stromatolites (small), Gamohaan Formation, South Africa, 2.5 billion years old. Sample composed of black chert. Voids are where carbonates weathered out.


Sample 6: Columnar stromatolite, Gamohaan Formation, South Africa, 2.5 billion years old. Sample composed of carbonate.


Sample 7: Domal stromatolite, Rossport Formation, Ontario, Canada, 1.4 billion years old. Composed of chert and carbonate


Sample 8: Conical stromatolite, Duck Creek Formation, Western Australia, 1.8 billion years old. Composed of chert and carbonate


Sample 9: Conical stromatolite, Sibley Group, Ontario, Canada, Mesoproterozoic


Sample 11a (sample 1 of 2): Conical stromatolite, Crystal Spring Formation, California, USA, ~1 billion years old, composed of carbonate


Sample 11b (sample 2 of 2): Conical stromatolite, Crystal Spring Formation, California, USA, ~1 billion years old, composed of carbonate


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