Earth and Planetary Sciences
Ordovician
100%
Brachiopod
87%
Late Ordovician
72%
Silurian
32%
Hirnantian
28%
Mass Extinction
28%
Phanerozoic
22%
Deep Water
22%
Phylogeography
21%
Greenland
21%
Early Ordovician
20%
Middle Ordovician
19%
Ordovician Period
18%
Locale
18%
Paleozoic
18%
Continent
17%
Keyphrases
Ordovician
91%
Darriwilian
37%
Biodiversity
34%
Great Ordovician Biodiversification Event
31%
Phanerozoic
29%
Early Paleozoic
25%
Brachiopods
24%
Late Ordovician
21%
Biodiversity Accumulation
21%
Phylogeography
21%
Middle Ordovician
21%
Late Cambrian
20%
Ordovician-Silurian
19%
Early Ordovician
16%
Plate Tectonics
15%
End-Ordovician Mass Extinction
15%
Time Slice
15%
Hirnantian
15%