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Heraclides Ponticus and Antimachus in contrast identified the Riphean Mountains with the Alps, and the Hyperboreans as a Celtic tribe (perhaps the Helvetii) who lived just beyond them. [19] Aristotle placed the Riphean mountains on the borders of Scythia, and Hyperborea further north. [20] Hecataeus of Abdera and others believed Hyperborea was ...
The map of North America with the Western Interior Seaway during the Campanian. The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, or the Western Interior Sea) was a large inland sea that split the continent of North America into two landmasses for 34 million years.
Laramidia stretched from modern-day Alaska to Mexico. [2] The area is rich in dinosaur fossils. Tyrannosaurs, dromaeosaurids, troodontids, hadrosaurs, ceratopsians (including Kosmoceratops and Utahceratops [3]), pachycephalosaurs, and titanosaur sauropods are some of the dinosaur groups that lived on this landmass.
One rift resulted in the North Atlantic Ocean. [20] Map of Earth around 120 million years ago, during the Early Cretaceous. The South Atlantic did not open until the Cretaceous when Laurasia started to rotate clockwise and moved northward with North America to the north, and Eurasia to the south.
Once back on American shores, Riley devoted himself to anti-slavery work but eventually returned to a life at sea.. He died March 13, 1840, on his vessel the Brig William Tell which he was sailing from New York to "St. Thomas in the Caribbean" [a] [5] "of disease caused by unparalleled suffering more than twenty years previous during his shipwreck and captivity on the desert of Sahara".
Laurentia basement rocks. Laurentia or the North American Craton is a large continental craton that forms the ancient geological core of North America.Many times in its past, Laurentia has been a separate continent, as it is now in the form of North America, although originally it also included the cratonic areas of Greenland and the Hebridean terrane in northwest Scotland.
This seaway had split North America into two massive landmasses due to a multitude of factors such as tectonism and sea-level fluctuations for nearly 40 million years. [ 1 ] [ 2 ] The seaway eventually expanded, divided across the Dakotas , and by the end of the Cretaceous, [ 3 ] it retreated towards the Gulf of Mexico and the Hudson Bay .
[5] [14] [15] Cole, who lived to be 103, was the only participant to live to a higher age than the raid's leader, Jimmy Doolittle, who died in 1993 at age 96. [ 16 ] [ citation needed ] On September 19, 2016, the Northrop Grumman B-21 was formally named "Raider" in honor of the Doolittle Raiders. [ 17 ]