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Law of Faunal Assemblages

2015-03-23 13:28 | Author:gzzjd | Reading:amount |


Law of Faunal Assemblages

It is a universal law of geology: fossil assemblage of the same organisms (fauna or flora) indicates they are of the same geologic age with the rocks where they are conserved.
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Geologic age Isotopic age (millions of years) Biological evolution
Eon Era Age
Phanerozoic eon (PH) Cenozoic (Q) Quaternary Period (Q) 2.60   Age of Man
Neogene Period (N) 23.3   Angiosperm and animal age
Paleogene Period (E) 65
Mesozoic (Mz) Cretaceous Period (K) 137   Gymnosperm and dinosaur age
Jurassic Period (J) 205
Triassic Period (T) 250
The Paleozoic Era (Pz) Permian Period (P) 295   Fern and amphibians age
Carboniferous period (C) 354
Devonian Period (D) 410   Psilophyte and fish age
Silurian Period (S) 438
Ordovician Period (O) 490   Eukaryon alga and Trilobita age
Cambrian Period (∈) 543
Proterozoic eon (PT) Neoproterozoic (Pt3) Sinian Period (Z) 680
Nanhua Period  (Nh) 800
Qingbaikou Period (Qb) 1000
Neoproterozoic (Pt2) Jixian Period (Jx) 1400
Changcheng Period (Ch) 1800 Germ and alga age
Neoproterozoic (Pt1) Hutuo Period(Ht) 2500
 
Archaean (AR) Neoarchean era(Ar3   2800
Mesoarchean era (Ar2)   3200
Paleoarchean era (Ar1)   3600
Eoarchean era (Ar0)     Era of formation and evolution for the earth.
 
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