Rhyacian

Rhyacian
2300 – 2050 Ma Pha. Proterozoic Archean Had.
A reconstruction of the Earth as it may have appeared in the early Rhyacian, c. 2.2 Ga.
Chronology
−2300 — – −2280 — – −2260 — – −2240 — – −2220 — – −2200 — – −2180 — – −2160 — – −2140 — – −2120 — – −2100 — – −2080 — – −2060 — – −2040 — P a l e o p r o t e r o z o i c Siderian Rhyacian Orosirian         ← Huronian glaciation   Major Glacial period Events of the Rhyacian Period. Axis scale: millions of years ago.
Etymology
Name formality	Formal
Usage information
Celestial body	Period
Stratigraphic unit	System
Time span formality	Formal
Lower boundary definition	Defined Chronometrically
Lower GSSA ratified	1991[1]
Upper boundary definition	Defined Chronometrically
Upper GSSA ratified	1991[1]

The Rhyacian Period (

The Huronian (Makganyene) global glaciation began at the start of the Rhyacian and lasted 100 million years. It lasted about 80% of this period.^[4]

For the time interval from 2250 Ma to 2060 Ma, an alternative period based on stratigraphy rather than chronometry, named either the Jatulian or the Eukaryian, was suggested in the geological timescale review 2012 edited by Gradstein et al.,

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