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The Central American Seaway (also known as the Panamanic Seaway, Inter-American Seaway and Proto-Caribbean Seaway) was a body of water that once separated North America from South America. It formed during the Jurassic (200–154 Ma ) during the breakup of the supercontinent Pangaea , and closed when the Isthmus of Panama was formed by volcanic ...
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.
The Continental Divide in North America in red and other drainage divides in North America The Continental Divide in Central America and South America. The Continental Divide of the Americas (also known as the Great Divide, the Western Divide or simply the Continental Divide; Spanish: Divisoria continental de las Américas, Gran Divisoria) is the principal, and largely mountainous ...
The idea of constructing a manmade waterway through Central America is old. The routes suggested usually ran across Nicaragua, Panama, or the Isthmus of Tehuantepec in Mexico. The colonial administration of New Spain conducted preliminary surveys as early as 1551, under the supervision of a Spanish explorer named Gormara. Nothing came of this ...
However, an article in Science magazine stated that zircon crystals in middle Miocene bedrock from northern Colombia indicated that by 10 Ma, it is likely that instead of islands, a full isthmus between the North and South American continents had already formed where the Central American Seaway had been previously. [19]
The Great Lakes St. Lawrence Seaway System opened its 66th navigation season on March 22, and the shipping channel's St. Lawrence River section will close on Jan. 5. Seaway officials ...
Panama is the southernmost portion of Central America and is the youngest section of the land bridge now connecting North and South America. The land bridge had finished forming around 3.5 million years ago during the late Pliocene–early Pleistocene with the closing of the Caribbean-Pacific seaway. [6]
The Columbia River is the only river on the West Coast (and arguably the entire North American Pacific coast) that is navigable for a significant length. The river is regularly dredged, and freight barges may reach as far inland as Lewiston, Idaho , through a system of locks; however, there are strict draft restrictions beyond the confluence ...