Gunflint Chert Stromatolite - Premium Specimen!
Age: Paleoproterozoic (1.9 Billion Years Old)
This specimen is from the Gunflint Formation, a Paleoproterozoic chemical-clastic sedimentary assemblage outcropping to the immediate northwest of Lake Superior that became famous in 1954 for containing the oldest fossil assemblage known at that time. Older microfossils have since been discovered, but the Gunflint prokaryotes remain one of the most diverse Precambrian fossil communities.
The wavy laminae seen here of the chertized stromatolites (chert is cryptocrystallized quartz) represents a facet of the early history of life on Earth.
Location: Gunflint Formation, Ontario, Canada (outside of the nature preserve), circa 1963. Legally collected on private land.
Size: 43mm H X 39mm W X 8mm D, Weight: 26.3 grams
Exceedingly nice specimen. Comes with display case, information and authenticity.
The face is polished, the back is natural.
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