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Huge thrombolite-stromatolite mass (compare its size with the theropod dinosaur in the background) from the
Cambrian of Virginia. This remarkable specimen is a >2 ton, 1.9 meter long-axis diameter thrombolite bioherm on public display at the Virginia Museum of Natural History (Martinsville,
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Stromatolites are large, layered structures built up by mats of cyanobacteria. Stromatolites vary in appearance, ranging from slightly wrinkled horizontal laminations in sedimentary rocks to low mounds to prominent mounds to columnar structures and other forms.
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Stromatolites are most common in the
Proterozoic fossil record. They are scarce today, but famous modern examples occur at Shark Bay, Western Australia.
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Thrombolite-stromatolite (1.9 m diameter) (Conococheague
Formation, Upper Cambrian; Boxley Materials Blue Ridge Quarry, Bedford County, Virginia, USA) 5
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Virginia, USA). It has a thrombolite core with a pustulose stromatolitic outer layer. It was collected in June 2008.
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Locality: Boxley
Materials Blue Ridge Quarry, Bedford County, Virginia, USA.
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Stratigraphy: Conococheague
Formation, Upper Cambrian.
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