GCMD Chronostratigraphic Units Types Keywords

SIDERIAN

https://gcmd.earthdata.nasa.gov/kms/concept/0b4a037a-03fb-475e-b1c4-f18bca899b80

broader
https://gcmd.earthdata.nasa.gov/kms/concept/a4a66454-acdb-4493-b5db-765653e5b824 original
narrower
0b4a037a-03fb-475e-b1c4-f18bca899b80 original
change note
2019-11-13 10:03:04.0 [tstevens] Insert Concept
add broader relation (SIDERIAN [0b4a037a-03fb-475e-b1c4-f18bca899b80,423329] - PALEOPROTEROZOIC [a4a66454-acdb-4493-b5db-765653e5b824,423293]);
2019-11-19 08:53:00.0 [tstevens]
insert Definition (id: null
text: The Siderian Period is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Ma to 2300 Ma (million years ago). The laying down of the banded iron formations (BIFs) peaked early in this period. BIFs were formed as anaerobic cyanobacteria produced waste oxygen that combined with iron, forming magnetite (Fe3O4, an iron oxide). This process removed iron from the Earth's oceans, presumably turning greenish seas clear. Eventually, with no remaining iron in the oceans to serve as an oxygen sink, the process allowed the buildup of an oxygen-rich atmosphere. This second, follow-on event is known as the oxygen catastrophe, which, some geologists believe triggered the Huronian glaciation.
language code: en);
definition The Siderian Period is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Ma to 2300 Ma (million years ago). The laying down of the banded iron formations (BIFs) peaked early in this period. BIFs were formed as anaerobic cyanobacteria produced waste oxygen that combined with iron, forming magnetite (Fe3O4, an iron oxide). This process removed iron from the Earth's oceans, presumably turning greenish seas clear. Eventually, with no remaining iron in the oceans to serve as an oxygen sink, the process allowed the buildup of an oxygen-rich atmosphere. This second, follow-on event is known as the oxygen catastrophe, which, some geologists believe triggered the Huronian glaciation.
reference
text International Commission on Stratigraphy (http://www.stratigraphy.org/)
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