The Hadean (/heɪˈdiːən, ˈheɪdiən/ hay-DEE-ən, HAY-dee-ən) is the first and oldest of the four known geologic eons of Earth's history, starting with the...

Hadean zircon is the oldest-surviving crustal material from the Earth's earliest geological time period, the Hadean eon, about 4 billion years ago. Zircon...

Precambrian is an informal unit of geologic time, subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation...

the second of the four geologic eons of Earth's history, preceded by the Hadean Eon and followed by the Proterozoic. The Archean represents the time period...

Adrian Hădean (born 4 September 1977, Arad) is a Romanian chef. He grew up in Baia Mare, a city in northern Romania, where he also made his debut as a...

erosion or melted, are more than 4 billion years old, formed during the Hadean Eon of Earth's geological history, and mark the start of the Archean Eon...

understanding of the Hadean eon. Older references generally show that Hadean Earth had a molten surface with prominent volcanos. The name "Hadean" itself refers...

formation of a solid crust, and allowing liquid water on the surface. The Hadean eon represents the time before a reliable (fossil) record of life; it began...

of the geologic record. It spans 431 million years, from the end of the Hadean Eon 4031 Mya to the start of the Paleoarchean Era 3600 Mya. Some estimates...

It includes the first three of the four eons of Earth's prehistory (the Hadean, Archean and Proterozoic) and precedes the Phanerozoic eon. Major volcanic...

date: Hadean zircons that formed around 4.404 billion years ago. These zircons have enabled deeper research into the conditions on Earth in the Hadean eon...

Oleg; Mojzsis, Stephen J. (May 21, 2009). "Microbial habitability of the Hadean Earth during the late heavy bombardment" (PDF). Nature. 459 (7245): 419–422...

UK: Hadean Press. ISBN 978-1-907881-07-7. Thompson, Cath (2016). The Magickal Language of the Book of the Law: An English Qaballa Primer. Hadean Press...

estimated to have been one of the largest ever to strike Earth since the Hadean Eon some four billion years ago, originally thought to have been approximately...

to ocean water at the end of the Hadean.: 10  The increasing solidification of Earth's crust at the end of the Hadean closed off most of the advective...

proposed Chaotian and Hadean boundary. The revised proposal in 2012 did not subdivide the proposed Chaotian era (of the Hadean eon) into periods. Age...

to 4.28 Gya from Quebec, soon after ocean formation 4.4 Gya during the Hadean. Life consists of reproduction with (heritable) variations. NASA defines...

authors have suggested that plate tectonics were already functional in the Hadean, over 4 billion years ago. Various types of quantitative and semi-quantitative...

notable scientific work as an unofficial subdivision of the terrestrial Hadean eon. Hadean eon-related topics W. Harland; R. Armstrong; A. Cox; L. Craig; A....

melting of this mafic crust. The presence of grains of the mineral zircon of Hadean age in Eoarchean sedimentary rocks suggests that at least some felsic crust...

work to subdivide the unofficial terrestrial Hadean eon. In particular, it is sometimes found that the Hadean eon is subdivided into the Cryptic era, Basin...

Mesoarchean (2.8–3.2 Ga) Paleoarchean (3.2–3.6 Ga) Eoarchean (3.6–4 Ga) Hadean Eon (4–4.6 Ga)   ka = kiloannum (thousand years ago); Ma = megaannum (million...

range: 3770–0 Ma Pha. Proterozoic Archean Had. Archean – present (possible Hadean origin) Diverse forms of life on a coral reef Scientific classification...

chronostratigraphic eonothem. There are four formally defined eons: the Hadean, Archean, Proterozoic and Phanerozoic. An era is the second largest geochronologic...

Emily Short 2013: Robin & Orchid by Ryan Veeder and Emily Boegheim 2014: Hadean Lands by Andrew Plotkin 2015: Sunless Sea by Failbetter Games 2016: Cactus...

the history of the Earth into major divisions, starting with four eons (Hadean, Archean, Proterozoic, and Phanerozoic), the first three of which are collectively...

geologist David Kring said that it can provide valuable information about the Hadean eon. Big Bertha shows that Earth was impacted by asteroids massive enough...

the Earth at 4.54 Ga (4.54 billion years), which is the beginning of the Hadean eon – a division of geological time. At the later end of the scale, it is...

Mesoarchean (2.8–3.2 Ga) Paleoarchean (3.2–3.6 Ga) Eoarchean (3.6–4 Ga) Hadean Eon (4–4.6 Ga)   ka = kiloannum (thousand years ago); Ma = megaannum (million...

Mesoarchean (2.8–3.2 Ga) Paleoarchean (3.2–3.6 Ga) Eoarchean (3.6–4 Ga) Hadean Eon (4–4.6 Ga)   ka = kiloannum (thousand years ago); Ma = megaannum (million...