Definitions for siderian
side·ri·an

WiktionaryRate this definition:0.0 / 0 votes

1. Siderianadjective

   Of a geologic period within the Paleoproterozoic era from about 2500 to 2300 million years ago.

2. Sideriannoun

   The Siderian period.

WikipediaRate this definition:0.0 / 0 votes

1. Siderian

   The Siderian Period ( ; Ancient Greek: σίδηρος, romanized: sídēros, meaning "iron") is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Ma to 2300 Ma (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The deposition of banded iron formations peaked early in this period. These iron rich formations 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.Since the time period from 2420 Ma to 2250 Ma is well-defined by the lower edge of iron-deposition layers, an alternative period named the Oxygenian, based on stratigraphy instead of chronometry, was suggested in 2012 in a geological timescale review.

WikidataRate this definition:0.0 / 0 votes

1. Siderian

   The Siderian is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Mya to 2300 Mya. Instead of being based on stratigraphy, these dates are defined chronometrically. Abundance of banded iron formations peaked early this period. BIFs were formed as anaerobic algae produced waste oxygen that combined with iron, forming magnetite. This process cleared iron from the oceans, presumably turning greenish seas clear. Eventually, without an oxygen sink in the oceans, the process created the oxygen-rich atmosphere of today. This event is known as the oxygen catastrophe, which according to some geologists triggered the Huronian glaciation. The Huronian glaciation took place in the Siderian between 2400 Mya and 2300 Mya.

Anagrams for siderian »

1. diarsine

2. draisine

How to pronounce siderian?

1. Alex

   US English

   David

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   Mark

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   Daniel

   British

   Libby

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   Mia

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   Karen

   Australian

   Hayley

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   Natasha

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   Neerja

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   Zira

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   Oliver

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How to say siderian in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of siderian in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of siderian in Pythagorean Numerology is: 7

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Siderian
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Siderian
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=siderian