List of Global Boundary Stratotype Sections and Points | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-15

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/List_of_Global_Boundary_Stratotype_Sections_and_Points


00:00:46 1 Organization of this list
00:02:25 2 List
00:02:34 2.1 Cenozoic
00:02:42 2.1.1 Quaternary
00:02:50 2.1.2 Neogene
00:02:57 2.1.3 Paleogene
00:03:05 2.2 Mesozoic
00:03:13 2.2.1 Cretaceous
00:03:21 2.2.2 Jurassic
00:03:29 2.2.3 Triassic
00:03:36 2.3 Paleozoic
00:03:45 2.3.1 Permian
00:03:52 2.3.2 Carboniferous
00:04:00 2.3.3 Devonian
00:04:08 2.3.4 Silurian
00:04:15 2.3.5 Ordovician
00:04:23 2.3.6 Cambrian
00:04:31 2.4 Precambrian
00:04:39 2.4.1 Proterozoic
00:04:47 2.4.2 Archean
00:04:54 3 See also
00:05:18 4 External links



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SUMMARY
=======
This is a list of Global Boundary Stratotype Sections and Points. Since 1977, Global Boundary Stratotype Sections and Points (abbreviated GSSPs) are internationally agreed upon reference points on stratigraphic sections of rock which define the lower boundaries of stages on the geologic time scale. They are selected by the International Commission on Stratigraphy based on multiple factors, but their accessibility and the degree to which they are representative of the same boundary on sections worldwide are among the most important.
Since GSSPs require well-preserved sections of rock without interruptions in sedimentation, and since most are defined by different stages of animal life, defining them becomes progressively more difficult as one goes further back in time.