GCMD Chronostratigraphic Units Types Keywords

EOARCHEAN

https://gcmd.earthdata.nasa.gov/kms/concept/8dff752e-939d-4b16-a735-bb4af8dbd785

broader
https://gcmd.earthdata.nasa.gov/kms/concept/7160e90a-d7c4-4817-9b1c-e82211688bdb original
narrower
8dff752e-939d-4b16-a735-bb4af8dbd785 original
change note
2019-11-13 10:08:16.0 [tstevens] Insert Concept
add broader relation (EOARCHEAN [8dff752e-939d-4b16-a735-bb4af8dbd785,423345] - ARCHAEAN [7160e90a-d7c4-4817-9b1c-e82211688bdb,396445]);
2019-11-15 09:33:26.0 [tstevens]
insert Definition (id: null
text: The Eoarchean is the first era of the Archean Eon of the geologic record for which the Earth has a solid crust. It spans 400 million years from the end of the Hadean Eon 4 billion years ago (4000 Mya) to the start of the Paleoarchean Era 3600 Mya. The beginnings of life on Earth have been dated to this era and evidence of cyanobacteria date to 3500 Mya, just outside this era. At that time, the atmosphere was without oxygen and the pressure values ranged from 10 to 100 bar (around 10 to 100 atmospheres).
language code: en);
definition The Eoarchean is the first era of the Archean Eon of the geologic record for which the Earth has a solid crust. It spans 400 million years from the end of the Hadean Eon 4 billion years ago (4000 Mya) to the start of the Paleoarchean Era 3600 Mya. The beginnings of life on Earth have been dated to this era and evidence of cyanobacteria date to 3500 Mya, just outside this era. At that time, the atmosphere was without oxygen and the pressure values ranged from 10 to 100 bar (around 10 to 100 atmospheres).
reference
text International Commission on Stratigraphy (http://www.stratigraphy.org/)
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