Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada

Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada

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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