Related articles:
Trilobite
Hirnantian
Orthoceras
Silurian
Paleozoic
Iapetus Ocean
Bioerosion
Taconic orogeny
Cambrian
Brachiopod
Nautiloid
Extinction event
Evolutionary history of life
Crinoid
Avalonia
Phacopida
Bryozoa
Gondwana
Cephalopod
Rugosa
Agnatha
Baltica
Coral
Laurentia
Marchantiophyta
Glomerales
Ostracoderm
Shark
Ordovices
Key terms:
ordovician
trilobites
cambrian
brachiopods
extinction
late ordovician
fauna
million years
caradoc
ocean
sea level
fossil
bryozoan
carbonate
extinction event
corals
silurian
gondwana
continents
diversity
llandeilo
shallow
million years ago
abundance
pole
echinoderm
paleozoic
genera
shale
subdivisions
glaciation
north america
volcanic
reef
estonia
iapetus ocean
calcium
mollusc
limestone
borings
outcrop
calcite
geology
shelf
ecological
south pole
faunal
baltica
ice age
green algae
flora
laurentia
predators
plankton
Search external links cited by footnotes on Wikipedia page Ordovician:
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