Land bridge

related topics
{island, water, area}
{theory, work, human}
{line, north, south}

A land bridge, in biogeography, is an isthmus or wider land connection between otherwise separate areas, which allows terrestrial animals and plants to cross over and colonise new lands. Land bridges can be created by marine regression, in which sea levels fall, exposing shallow, previously submerged sections of continental shelf; or when new land is created by plate tectonics; or occasionally when the sea floor rises due to post-glacial rebound after an ice age.


Prominent examples

Land bridge theory

In the 19th century a number of scientists noted puzzling geological and zoological similarities between widely separated areas. To solve these problems, "…whenever geologists and paleontologists were at a loss to explain the obvious transoceanic similarities of life that they deduced from the fossil records, they sharpened their pencils and sketched land bridges between appropriate continents."[1] The concept was first proposed by Jules Marcou in Lettres sur les roches du Jura.[2]

These hypothetical land bridges included:[3]

  • Lemuria in the Indian Ocean
  • Archiboreis in the North Atlantic
  • Archatlantis from the West Indies to North Africa
  • Archhelenis from Brazil to South Africa
  • Archigalenis from Central America through Hawaii to Northeast Asia
  • Archinotis from South America to Antarctica

All of these became obsolete with the gradual acceptance of continental drift and the development of plate tectonics by the mid-20th century.

Land bridge Applications in Intermodal Freight Transport

Full article ▸

related documents
Geography of Eritrea
Geography of Peru
Geography of Guinea
Geography of Saint Helena
Geography of the Republic of the Congo
Cumulonimbus cloud
Geography of the Republic of Ireland
Karakum Desert
North Atlantic Deep Water
Geography of Tuvalu
Little Desert National Park
Kingman Reef
Geography of the Cayman Islands
East Frisian Islands
Geography of Malta
Geography of Haiti
Geography of Guam
Geography of Ecuador
Montara, California
Geography of Burundi
Gulf of Finland
Geography of Guinea-Bissau
Casiquiare canal