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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. The ancient sea, which existed from the early Late Cretaceous (100 Ma) to the earliest Paleocene ...
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 ...
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.
Zealandia (pronounced / z iː ˈ l æ n d i ə /), also known as Te Riu-a-Māui [2] or Tasmantis (from Tasman Sea), [3] [4] is an almost entirely submerged mass of continental crust in Oceania that subsided after breaking away from Gondwana 83–79 million years ago. [5]
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 .
Pytheas was a central source of information on the North Sea and the subarctic regions of western Europe to later periods, and possibly the only source. The only ancient authors we know by name who certainly saw Pytheas' original text were Dicaearchus , Timaeus , Eratosthenes , Crates of Mallus , Hipparchus , Polybius , Artemidorus and ...
The son of Aglaos, Eratosthenes was born in 276 BC in Cyrene.Now part of modern-day Libya, Cyrene had been founded by Greeks centuries earlier and became the capital of Pentapolis (North Africa), a country of five cities: Cyrene, Arsinoe, Berenice, Ptolemias, and Apollonia.