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Artist's depiction of the end-Cretaceous impact eventSince the 19th century, a significant amount of research has been conducted on the Cretaceous–Paleogene extinction event, the mass extinction that ended the dinosaur-dominated Mesozoic Era and set the stage for the Age of Mammals, or Cenozoic Era.
The Mesozoic Era [3] is the era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods.It is characterized by the dominance of archosaurian reptiles such as the dinosaurs, and of gymnosperms such as cycads, ginkgoaceae and araucarian conifers; a hot greenhouse climate; and the tectonic break-up of Pangaea.
At the end of the Cretaceous, the impact of a large body with the Earth may have been the punctuation mark at the end of a progressive decline in biodiversity during the Maastrichtian age. The result was the extinction of three-quarters of Earth's plant and animal species.
Of all the phases Earth has been through, the Mesozoic Era stands out among the rest—even from off-world. A Study Says the Mesozoic Era Is the Key to Finding the Elusive Second Earth in Space ...
Conodonts were a major vertebrate group which died out at the end of the Triassic. Fish did not suffer a mass extinction at the end of the Triassic. The Late Triassic in general did experience a gradual drop in actinopterygiian diversity after an evolutionary explosion in the Middle Triassic.
The Triassic is the first and shortest period of the Mesozoic Era and the seventh period of the Phanerozoic Eon. Both the start and end of the period are marked by major extinction events. [10] The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic.
The History of Middle-earth is a 12-volume series of books published between 1983 and 1996 by George Allen & Unwin in the UK and by Houghton Mifflin in the US. They collect and analyse much of J. R. R. Tolkien 's legendarium , compiled and edited by his son Christopher Tolkien .
Costco is closing the book on year-round sales of physical novels. The bulk retailer is looking to end constant book sales at 500 of its 600 stores across the U.S., according to reports .