The Llandovery Series is the first series of the Silurian period, spanning from about 443.8 to 433.4 million years ago. It is known for significant evolutionary developments in marine life, including the appearance of the first jawed vertebrates and diverse coral reefs. The Llandovery marks a crucial transition in Earth's history as it follows the mass extinction at the end of the Ordovician period, leading to a recovery in biodiversity.
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