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The Abbassia Pluvial was an extended wet and rainy period in the climate history of North Africa, lasting from c. 120,000 to 90,000 years ago. As such it spans the transitional period connecting the Lower and Middle Paleolithic .
Abbassia Pluvial wet in North Africa 108,000–8,000: Last Glacial Period, not to be confused with the Last Glacial Maximum or Late Glacial Maximum below. (The following events also fall into this period.) 48,000–28,000: Mousterian Pluvial wet in North Africa 26,500–19,000: Last Glacial Maximum, what is often meant in popular usage by "Last ...
These ancient climatic periods have been gradually replaced in the scientific literature by the isotopic chronology in force since the end of the 20th century, which defines the alternation of glacial and interglacial periods on a global scale.
The observatory at Abbassia was an empty monument until 1952. [8] [9] Abbassia and the nearby region saw heavy rainfall during a period of time geological researchers call the Pluvial Abbassia. During this period, red, green and purple rocks or gravel became distributed all along the valley and Delta regions of the Nile. Gravel beds were formed ...
The idea that changes in insolation caused by shifts in the Earth's orbital parameters are a controlling factor for the long-term variations in the strength of monsoon patterns across the globe was first suggested by Rudolf Spitaler in the late nineteenth century, [5] The hypothesis was later formally proposed and tested by the meteorologist John Kutzbach in 1981. [6]
During periods of a wet or Green Sahara, the Sahara and Arabia become a savanna grassland and African flora and fauna become common. [5] [unreliable source?] Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions, usually as a result of the retreat of the West African Monsoon southwards.
The Mousterian Pluvial is a mostly obsolete term for a prehistoric wet and rainy period in North Africa. It was described as beginning around 50,000 years before the present ( BP ), lasting roughly 20,000 years, and ending ca. 30,000 BP.
The modern, arid Sahara. The Sahara was not a desert during the African humid period. Instead, most of northern Africa was covered by grass, trees, and lakes. The African humid period (AHP; also known by other names) was a climate period in Africa during the late Pleistocene and Holocene geologic epochs, when northern Africa was wetter than today.