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and like any human endeavor
Science Matters
the shells of ammonites had an inner layer known as the nacre or "mother of pearl"
Species: Tyrannosaurus rex
rivaling that of the Smilodon
Trilobite - SOLD 1.409" Devonian Fossil protomammal and like any human endeavorThe Cambrian Explosion brought new life and diversity to the ocean. 521,000,000 years ago, the first trilobites emerged in the fossil record thanks to this evolutionary event. With a tough exoskeleton, trilobites were one of the earliest known arthropods and quickly spread across the planet thanks to their incredible adaptability. This specimen is a complete 1. 409" Devonian Period trilobite fossil. It comes from Morocco and is dated to be around 380
