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The 4.2-kiloyear (thousand years) BP aridification event (long-term drought), also known as the 4.2 ka event, [2] was one of the most severe climatic events of the Holocene epoch. [3] It defines the beginning of the current Meghalayan age in the Holocene epoch. Starting around 2200 BC, it most likely lasted the entire 22nd century BC.
Permian–Triassic extinction event: 199.6: Triassic–Jurassic extinction event, causes as yet unclear 66: Perhaps 30,000 years of volcanic activity form the Deccan Traps in India, or a large meteor impact. 66: Cretaceous–Paleogene boundary and Cretaceous–Paleogene extinction event, extinction of dinosaurs: 55.8: Paleocene–Eocene Thermal ...
Expeditions in Antarctica before the Heroic Age of Antarctic Exploration, 1897 Early Western theories believed that in the far south of the globe existed a vast continent, known as Terra Australis . The rounding of the Cape of Good Hope and Cape Horn in the 15th and 16th centuries proved that Terra Australis Incognita ("Unknown Southern Land ...
It is now widely accepted that the devastation and climate disruption resulting from the impact was the primary cause of the Cretaceous–Paleogene extinction event, a mass extinction of 75% of plant and animal species on Earth, including all non-avian dinosaurs.
The Age of Discovery (c. 1418 – c. 1620), [1] also known as the Age of Exploration, was part of the early modern period and largely overlapped with the Age of Sail. It was a period from approximately the late 15th century to the 17th century, during which seafarers from a number of European countries explored, colonized, and conquered regions ...
Bond events are North Atlantic ice rafting events which Gerard Bond sought to link to climate fluctuations in the Holocene. Eight such events have been identified. Bond events were previously believed to exhibit a roughly c. 1,500-year cycle, but the primary period of variability is now put at c. 1,000 years.
A similar event occurred with photosynthetic cyanobacteria [124] entering large heterotrophic cells and becoming chloroplasts. [ 112 ] : 60–61 [ 125 ] : 536–539 Probably as a result of these changes, a line of cells capable of photosynthesis split off from the other eukaryotes more than 1 billion years ago.
Mercury anomalies during the PETM point to massive volcanism during the event. [169] On top of that, increases in ∆ 199 Hg show intense volcanism was concurrent with the beginning of the PETM. [170] Osmium isotopic anomalies in Arctic Ocean sediments dating to the PETM have been interpreted as evidence of a volcanic cause of this hyperthermal ...