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including the Permian-Triassic extinction
making it roughly a third smaller
The exact cause is unclear
Geological Context and Mineralization
3.8" Colonial Rugose Coral Fossil Devonian Age Speed Quarry, Clark County, Indiana Knightia including the Permian-Triassic extinctionLocation: Speed Quarry, Clark County, Indiana Weight: 7. 5 Ounces Dimensions: 3. 8 Inches Long, 3. 8 Inches Wide, 2. 2 Inches Thick Middle Devonian Age 380 Million Years Old The item pictured is the one you will receive. Colonial Rugose Fossil Coral (Prismatophyllum Prisma) Dare to own a relic from one of nature's boldest experiments in reef formation. During the Devonian period410 million years agocorals entered the oceans with remarkable force,
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