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Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada
National Research Council Canada,
Alfred C. Lenz,
Anna Kozłowska-Dawidziuk,
National Research Council Canada. Monograph Publishing Program
—
2004
Graptolites flourished from earliest Ordovician to Early Devonian, a time range of about 90 million years, and were widely distributed as marine benthic and planktonic colonial organisms around then-world.
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