Ordovician period
A period of the Paleozoic era that spans
the time between the Cambrian and the Silurian,
about 490 to 443 million years ago. The Ordovician period is best known
for the presence of its diverse marine invertebrates, including graptolites,
trilobites, brachiopods,
and the conodonts (early vertebrates). Related category
GEOLOGY
AND PLANETARY SCIENCE
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