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There are seashell fossils that are 65 million years old. They are found in areas that were once covered by ancient seas/oceans. I live in an area of CA where if you go to the right place you can find them plus ancient shark teeth.
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In fact fossil shells far older than that are common, if not necessarily in California. That 65Ma marks the end of the Creataceous and prior to the that the Jurassic, both rich in life now represented by fossils. Limestones from The Carboniferous (represented in the US by e.g. the Pennsylvanian) , hold fossil corals and shells from well over 300Ma; but the oldest significant fossils of sea creatures are of Cambrian age..
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How old was the worlds oldest plant?
Ferns are the worlds oldest type of plant.A:`Methuselah` is the oldest known living tree and non-clonal organism in the world and is estimated to be 4,842 years old as of 2011. Methuselah is a Great Basin Bristlecone Pine (Pinus longaeva) tree growing high in the White Mountains of Inyo County in eastern California.
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