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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.
In contrast, the North American Jurassic record is the poorest of the Mesozoic, with few outcrops at the surface. [48] Though the epicontinental Sundance Sea left marine deposits in parts of the northern plains of the United States and Canada during the late Jurassic, most exposed sediments from this period are continental, such as the alluvial ...
The Mesoproterozoic was the first era of Earth's history for which a fairly definitive geological record survives. Continents existed during the preceding era (the Paleoproterozoic), but little is known about them. The continental masses of the Mesoproterozoic were more or less the same ones that exist today, although their arrangement on the ...
Of all the phases Earth has been through, the Mesozoic Era stands out among the rest—even from off-world. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290 ...
Mesozoa were once thought to be evolutionary intermediate forms between Protozoans and Metazoans, but now they are thought to be degenerate or simplified metazoa.Their ciliated larvae are similar to the miracidium of trematodes, and their internal multiplication is similar to what happens in the sporocysts of trematodes.
The mode of Mesozoic dinosaur body masses is between 1 and 10 metric tons (1.1 and 11.0 short tons). [139] This contrasts sharply with the average size of Cenozoic mammals, estimated by the National Museum of Natural History as about 2 to 5 kg (4.4 to 11.0 lb). [140] The sauropods were the largest and heaviest dinosaurs.
This category contains events which happened in the Mesozoic, a division of the geologic time scale. See geologic time scale for information about its divisions and how they relate to each other. See also the preceding Category:Paleozoic and the succeeding Category:Cenozoic
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