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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 gymnosperms such as cycads, ginkgoaceae and araucarian conifers, and of archosaurian reptiles such as the dinosaurs; a hot greenhouse climate; and the tectonic break-up of Pangaea.
The eastern United States was part of Pangaea's interior for most of the Triassic Period of the Mesozoic era. At the time, the area lay close to the equator and was connected to western Europe and Africa. The union of all of Earth's continents into a single land mass changed the way the atmosphere and oceans circulated.
During much of the Mesozoic Era, the North American continental interior was mostly well above sea level, with two notable exceptions. During part of the Jurassic (208-144 million years ago), rising seas flooded the low-lying areas of the continent. Much of the Interior Plains eventually lay submerged beneath the shallow Sundance Sea. [16]
The geological timeline of Western North America includes significant geological events over millions of years in the evolution of Western North America, including several tectonic plate interactions involving the North American plate and leading to the formation of various mountain ranges and seaways.
View history; Tools. Tools. move to sidebar hide. ... Mesozoic Era in Prehistoric North America ... Mesozoic life of North America (5 C, ...
By the end of the Mesozoic, the Appalachian Mountains had been eroded to an almost-flat plain. [10] It was not until the region was uplifted during the Cenozoic era that the distinctive topography of the present formed. [11] Uplift rejuvenated the streams, which rapidly responded by cutting downward into the ancient bedrock. Some streams flowed ...
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 ...
North America during the Campanian. Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two. In the Mesozoic era, Laramidia was an island land mass separated from Appalachia to the east by the