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In geology, a debate remains open concerning the use of Myr (duration) plus Mya (million years ago) versus using only the term Ma. [1] [2] In either case, the term Ma is used in geology literature conforming to ISO 31-1 (now ISO 80000-3) and NIST 811 recommended practices.
rocks older than 2.5 Billion years – rocks older than 3.6 Billion years [1] [2] Neoarchean: 2500 Mya – 2800 Mya (only GSSA points) Mesoarchean: 2800 Mya – 3200 Mya: Paleoarchean: 3200 Mya – 3600 Mya: Eoarchean: 3600 Mya – 4000 Mya: Earth's crust solidifies ca 3800 Mya [3] Note: Rocks older than ca. 2500 Mya old are rare due to ...
List of volcanoes in French Polynesia. ... 3.1 Mya Mangareva: 441: 1446 extinct Mehetia: 435: 1427 <31,000 years ago ... <31,000 years ago
Dryopithecus is a genus of extinct great apes from the middle–late Miocene boundary of Europe 12.5 to 11.1 million years ago (mya). Since its discovery in 1856, the genus has been subject to taxonomic turmoil, with numerous new species being described from single remains based on minute differences amongst each other, and the fragmentary nature of the holotype specimen makes differentiating ...
1.95–0.13 Mya: Type site: ... from the French acheuléen after the type ... and in 2023 finds from Ethiopia were reported dating to 1.95 million years ago. [2] ...
2.1 Notes. 2.2 Literature. ... It spans the time between 86.3 ± 0.7 mya (million years ago) ... The Santonian Stage was established by French geologist Henri Coquand ...
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Approximate extent of the Karoo Glaciation (in blue), over the Gondwana supercontinent during the Carboniferous and Permian periods. The late Paleozoic icehouse, also known as the Late Paleozoic Ice Age (LPIA) and formerly known as the Karoo ice age, was an ice age that began in the Late Devonian and ended in the Late Permian, [1] occurring from 360 to 255 million years ago (Mya), [2] [3] and ...