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01 – FOSSILS INVERTEBRATES

INVERTEBRATES, Earliest Simple Life Forms, e.g. Stromatolites

Cut-and-polished cross-section of a stromatolite fossil, Collenia undosa, a record of one of the oldest living things on this planet that can be seen with the naked eye. These layers of blue-green algae date back to the Precambrian, more than 2 billion years old. Red coloration comes from oxidized iron in the Biwabik Iron Formation of northern Minnesota, USA. Specimen courtesy of Dr. Klaus Westphal, Museum of Geology, University of Wisconsin, Madison Campus (please include specimen credits in publications). — UMN-0006_stromatolite-fossil

Cut and polished slab of Pre-Cambrian (2.2 to 2.4 billion years old) stromatolite from the eastern side of the Andes Mountain Range south of Cochabamba, District of Cochabamba, Bolivia, South America. — TAW-0002_Bolivian-stromatolite

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