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As the theory of the Pangean megamonsoon began to increase in credibility, paleoclimatologists predicted the climatological impacts of the circulation to ascertain whether observations and models supported the hypothesis. The general consensus listed four primary signs that needed to be present to validate the existence of megamonsoon. [3]
Map of Pangea around 250 million years ago, at the beginning of the Triassic. Pangaea or Pangea (/ p æ n ˈ dʒ iː ə / pan-JEE-ə) [1] was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. [2]
Map of Earth during the Early Permian, around 285 million years ago, showing Central Pangean mountain range at equator. The Central Pangean Mountains were formed during the collision of Euramerica and northern Gondwana as part of the Variscan and Alleghanian orogenies, which began during the Carboniferous approximately 340 million years ago, and complete by the beginning of the Permian around ...
Pangaea was completely assembled by the Permian except for the Asian blocks. The supercontinent was centred on the Equator during the Triassic and Jurassic, a period that saw the emergence of the Pangaean megamonsoon. [27] Heavy rainfall resulted in high groundwater tables, in turn resulting in peat formation and extensive coal deposits. [28]
The Phanerozoic supercontinent Pangaea began to break up 215 Ma and this distancing continues today. Because Pangaea is the most recent of Earth's supercontinents, it is the best known and understood.
These climate transitions were subtle, and the formation as a whole was assigned a climate with cool dry winters and hot rainy summers enhanced by the Pangean megamonsoon. [ 44 ] [ 19 ] [ 20 ] Warm temperate grasslands in Oklahoma and central Argentina were considered the closest modern equivalent to the Ischigualasto paleoenvironment.
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This region was heavily influenced by the Triassic Pangaean monsoon system, often referred to as a "megamonsoon". While many Keuper clay beds contain evaporitic sulphate minerals, the deposits are unique in their lack of such minerals, despite showing desiccation features like mudcrack s. [ 3 ]