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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 ...
This journey was 19,019 miles (30,608 km) on foot, completed in 2,426 days [1] (1977–1983) and is documented in his book The Longest Walk (1988). He received substantial media coverage (including appearances on the Today Show , CBS Morning News and Larry King Live ) and was featured in numerous public speaking forums.
Henson in his Arctic furs. While working at a Washington D.C. clothing store, B.H. Stinemetz and Sons, in November 1887, Henson met Commander Robert E. Peary.Learning of Henson's sea experience, Peary recruited him as an aide for his planned voyage and surveying expedition to Nicaragua, with four other men.
Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya). [1]The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
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 .
It has also purchased lands for preservation, contributing a total of 109 million acres (421,000 km 2) to the National Wilderness Preservation System. [36] Marshall's dream of permanent wilderness protection became a reality 25 years after his death when President Lyndon B. Johnson signed the Wilderness Act into law on September 3, 1964, in the ...
The Zanclean flood or Zanclean deluge is theorized to have refilled the Mediterranean Sea 5.33 million years ago. [1] This flooding ended the Messinian salinity crisis and reconnected the Mediterranean Sea to the Atlantic Ocean, although it is possible that even before the flood there were partial connections to the Atlantic Ocean. [2]
Cumberland Island constitutes the westernmost point of shoreline on the Atlantic Ocean in the United States. The island is 17.5 miles (28.2 km) long, with an area of 36,415 acres (147.37 km 2 or 56.90 square miles), including 16,850 acres (68.2 km 2) of marsh, mudflats, and tidal creeks.