- published: 29 Aug 2011
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Lemuria ( /lɨˈmjʊəriə/) is the name of a hypothetical "lost land" variously located in the Indian and Pacific Oceans. The concept's 19th century origins lie in attempts to account for discontinuities in biogeography; however, the concept of Lemuria has been rendered obsolete by modern theories of plate tectonics. Although sunken continents do exist – like Zealandia in the Pacific and the Kerguelen Plateau in the Indian Ocean – there is no known geological formation under the Indian or Pacific Oceans that corresponds to the hypothetical Lemuria[citation needed].
Though Lemuria is no longer considered a valid scientific hypothesis, it has been adopted by writers involved in the occult, as well as some Tamil writers of India. Accounts of Lemuria differ, but all share a common belief that a continent existed in ancient times and sank beneath the ocean as a result of a geological, often cataclysmic, change, such as pole shift.
In 1864 the zoologist and biogeographer Philip Sclater wrote an article on "The Mammals of Madagascar" in The Quarterly Journal of Science. Using a classification he referred to as lemurs but which included related primate groups, and puzzled by the presence of their fossils in both Madagascar and India but not in Africa or the Middle East, Sclater proposed that Madagascar and India had once been part of a larger continent. He wrote:
Lemuria may refer to:
A continent is one of several very large landmasses on Earth. They are generally identified by convention rather than any strict criteria, with seven regions commonly regarded as continents—they are (from largest in size to smallest): Asia, Africa, North America, South America, Antarctica, Europe, and Australia.
Plate tectonics is the geological process and study of the movement, collision and division of continents, earlier known as continental drift.
Conventionally, "continents are understood to be large, continuous, discrete masses of land, ideally separated by expanses of water." Many of the seven most commonly recognized continents identified by convention are not discrete landmasses separated by water. The criterion "large" leads to arbitrary classification: Greenland, with a surface area of 2,166,086 square kilometres (836,330 sq mi) is considered the world's largest island, while Australia, at 7,617,930 square kilometres (2,941,300 sq mi) is deemed to be a continent. Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as two continents; and/or Eurasia and Africa as two continents, with no natural separation by water. This anomaly reaches its extreme if the continuous land mass of Europe and Asia is considered to constitute two continents. The Earth's major landmasses are washed upon by a single, continuous world ocean, which is divided into a number of principal oceanic components by the continents and various geographic criteria.