WebApr 30, 2024 · However, even during the mid-Cretaceous Period when northern Africa was covered by vast river systems, ecosystems dominated by so many bulky predators would have been rare. WebApr 1, 2005 · Much of the drainage of Africa is relatively youthful. Many of its major rivers have shown substantial changes in their courses since the break up of Gondwanaland in the Cretaceous. In...
Geology of South Africa - Wikipedia
WebJul 26, 2024 · The Cretaceous period lasted approximately 79 million years, and ended with a major extinction event about 66 million years ago. ... Africa and South America had assumed their distinctive shapes ... WebMay 26, 2024 · The present-day West African drainage system has stabilized in the Early Oligocene, following the onset of hotspot-related growth of topographic massifs such as the Hoggar and the Tibesti ( Chardon et al., 2016 ), which led to the basin-and-swell physiography of the continent ( Burke, 1996 ). hawksearch knowledge base
The drainage of Africa since the Cretaceous
WebLimited erosion means that many of the major relief features of South Africa have existed since the Late Cretaceous. Warping of Southern Africa has led to significant changes in … WebNov 1, 2024 · By Late Cretaceous times, from ~100 million years ago, large-scale tectonic changes altered much drainage westwards into an interior sea, the Western Interior Seaway, located in the approximate position of the present-day Rocky Mountains, global sea level then being 100–200 m higher than today (Miller et al., 2011). WebThe Río Tinto, located in the Iberian Pyrite Belt (SW Spain), constitutes an extreme case of pollution by acid mine drainage. Mining in the area dates back to the Copper Age, although large-scale mining of massive sulfide deposits did not start until the second half of the 19th century. Due to acidic mining discharges, the Río Tinto usually maintains … hawksearch login