TwoOldGuys™ Study Guides
BI-114 BioConcepts for Teachers
4. History of Life
4.5. 7th Extinction

based on Indiana's Academic Standards, Science,
as adopted by the Indiana State Board of Education, Nov 2000.

numbers refer to the age-appropriate grade-level for the content.


Review

Geological Time

Footnotes:
1 [Dansereau 1957: P. 119]
2 [Science 308(1 Apr 2005): P. 95-98]
3 [Science 307(18 Feb 2005): p. 1088]
4 [Science 308(24 Jun 2005): P. 1894-1898]
5 [Science 309(29 Jul 2005): P. 758-761]
6 [Science 310(18 Nov 2005): P. 1177-1180]
7 [Science 311(17 Mar 2006): P. 1523]
period epoch MYr BP plants animals
0.004 cooling1
0.0008 xerothermic1
Quaternary Recent 0.01 grassland,
desert
Human
0.178-0.128 penultimate deglaciation7
pCO2(atmospheric) increase
pCH4(atmospheric) increase
Pleistocene 2 mass extinction #7 starts
Pleistocene glaciation
4.5-3.0 Pliocene thermal max5
55 Paleocene-Eocene thermal max4
Tertiary 65 modern plants,
Grass
Primates,
Insects
65 mass extinction #6
Cretaceous 130 Flowers,
grass6
Mammals
Jurassic 175 Cycads Dinosaurs
(raptors),
Birds
175 mass extinction #5
Triassic 220 Forests Dinosaurs
220 mass extinction #4; glacial
Permian 270 Conifers Reptiles
Carboniferous 350 Fern trees Reptiles
350 mass extinction #3
Devonian 400 Ferns Insects,
Amphibians
Silurian 440 land plants Sharks,
insects(?)
440 mass extinction #2; glacial
Ordovician 500 Algae jawless fish
580 Gaskiers glaciation
Cambrian 600 Algae (seaweed) invertebrates
(shellfish)
635 end of Marinoan glacial2
Pre-Cambrian 1,500 Protista Protista
1,800 mass extinction #13
Pre-Cambrian 2,300 Archaea, Bacteria, Bluegreens
Pre-Cambrian 3,500 Archaea, Bacteria
4,500 Earth forms





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