GCMD Chronostratigraphic Units Types Keywords

HADEAN

https://gcmd.earthdata.nasa.gov/kms/concept/c7626c29-a1d3-4d0c-a263-616fe060f164

broader
https://gcmd.earthdata.nasa.gov/kms/concept/a9f88ca9-5d19-45fa-8fbb-3c6ff5f1f190 original
narrower
c7626c29-a1d3-4d0c-a263-616fe060f164 original
change note
2019-11-14 08:58:56.0 [tstevens]
insert Definition (id: null
text: Hadean time (4.6 to 4 billion years ago)* is not a geological period as such. No rocks on the Earth are this old, except for meteorites. During Hadean time, the Solar System was forming, probably within a large cloud of gas and dust around the sun, called an accretion disc. The relative abundance of heavier elements in the Solar System suggests that this gas and dust was derived from a supernova, or supernovas — the explosion of an old, massive star.
language code: en);
2019-11-19 09:20:34.0 [tstevens]
update Definition (Hadean time (4.6 to 4 billion years ago) is not a geological period as such. No rocks on the Earth are this old, except for meteorites. During Hadean time, the Solar System was forming, probably within a large cloud of gas and dust around the sun, called an accretion disc. The relative abundance of heavier elements in the Solar System suggests that this gas and dust was derived from a supernova, or supernovas — the explosion of an old, massive star.);
definition Hadean time (4.6 to 4 billion years ago) is not a geological period as such. No rocks on the Earth are this old, except for meteorites. During Hadean time, the Solar System was forming, probably within a large cloud of gas and dust around the sun, called an accretion disc. The relative abundance of heavier elements in the Solar System suggests that this gas and dust was derived from a supernova, or supernovas — the explosion of an old, massive star.
reference
text International Commission on Stratigraphy (http://www.stratigraphy.org/)
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in scheme chronounits original