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- Geologic time scale (26014 bytes)
1: The '''geologic time scale''' is used by [[geologist]]s and other scientis...
3: ...ach period. Different spans of time on the time scale are usually delimited by major [[geology|geolog...
7: ...nges in the observed fossil assemblages. In many cases, such faunal stages have been adopted in build...
9: ...ng terminology and define universal horizons that can be used around the world.
11: ==History of the time scale== - Vertebrate (4613 bytes)
2: <!-- {{Taxobox_image | image = | caption = }} -->
22: :[[Chondrichthyes]] (cartilaginous fish)<br />
23: :[[Acanthodii]]<br />
26: ::[[Sarcopterygii]] (lobe-finned fish)<br />
27: :::[[Actinistia]] ([[coelacanth]]s)<br /> - Chordate (3099 bytes)
2: <!-- {{Taxobox_image | image = | caption = }} -->
7: ...n_subdivision | color = pink | plural_taxon = Typical Classes}}
8: * Subphylum [[Tunicate|Urochordata]] - Tunicates
17: ** [[Chondrichthyes]] - Cartilaginous fishes
18: ** [[Acanthodii]] (''extinct'') - Tetrapod (26290 bytes)
2: <!-- {{Taxobox_image | image = | caption = }} -->
7: {{Taxobox_subclassis_entry | taxon = [[Sarcopterygii]]}}
13: [[Acanthostega|Acanthostegidae]]<br>
28: ...the earliest tetrapods, which radiated from the [[Sarcopterygii]], or "lobe-finned" [[fish]]es, into air-breathin...
35: ... and hind limbs that bend forward at the [[knee]] can plausibly be traced to early tetrapods living in...
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