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The oldest Precambrian rocks in Nigeria likely formed during the Archean or the Paleoproterozoic, forming the Beninian gneiss, in the Benin-Nigeria Orogen, formed during the Proterozoic Pan-African orogeny. The crystalline basement rock of the country is grouped as the Nigerian Province, a southern continuation of the central Hoggar reactivated ...
The southern region of Nigeria experiences a double rainfall maxima with two high peaks. The first rainy season starts in March, ending in June. The August break, a short dry season, follows, followed by a short rainy season in September and a long dry season in October. [8] Köppen climate classification map of Nigeria
Geologic map showing the regions and major features of the Himalayas. The Himalayas consist of four parallel mountain ranges from south to north: the Sivalik Hills on the south; the Lower Himalayas; the Great Himalayas, which is the highest and central range; and the Tibetan Himalayas on the north. [31] [32] [26]
Similarly, another author indicated that there are 14 distinct biomes, including forests, grasslands, and deserts, among the 846 ecoregions that make up the area. Ecoregions vary in size; the island group of St. Peter and St. Paul Rocks in the Atlantic Ocean is only 6 km2, while the East Siberian Taiga is 39 million km2.
Indian rhinoceros in the Terai. Above the alluvial plain lies the Terai strip, a seasonally marshy zone of sand and clay soils. The Terai has higher rainfall than the plains, and the downward-rushing rivers of the Himalaya slow down and spread out in the flatter Terai zone, depositing fertile silt during the monsoon season and receding in the dry season.
Bhabar is the gently-sloping coarse alluvial zone below the Sivalik Hills (outermost foothills of the Himalayas) where streams disappear into permeable sediments. The underground water level is deep in this region, then rises to the surface in the Terai below where coarse alluvium gives way to less permeable silt and clay .
Collision of the Indian continent with Eurasia occurred at about 55 million years ago. Source: www.usgs.org (modified) Fig 5: Geologic - Tectonic map of the Himalaya, modified after Le Fort & Cronin (1988). Green is the Indus-Yarlung suture zone. Fig 6: Geological Map of the NW Himalaya; for references, see image description or bibliography ...
The area is a meeting point of species of Indian and Malayan origin. The endemic mammals of the valley are the pygmy hog and the hispid hare, both of which inhabit the grasslands of the riverbanks. The valley is home to rich bird life with 370 species of which two are endemic, the Manipur bush quail ( Perdicula manipurensis ) and the marsh ...