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Continent" meant, at that time, one of the three known continents, Europe, Africa and Asia, that adjoined each other (from Latin "continens"="touching") surrounded by the Ocean, which was divided by Africa into the Western, or Atlantic and Eastern, or Indian Oceans which contained the Earth's large and small islands. [16]
Insular India was an isolated landmass which became the Indian subcontinent.Across the latter stages of the Cretaceous and most of the Paleocene, following the breakup of Gondwana, the Indian subcontinent remained an isolated landmass as the Indian Plate drifted across the Tethys Ocean, forming the Indian Ocean.
The Buddhist cosmology divides the bhūmaṇḍala (circle of the earth) into three separate levels: Kāmadhātu (Desire realm), Rūpadhātu (Form realm), and Ārūpyadhātu (Formless realm). In the Kāmadhātu is located Mount Meru (Sumeru), which is said to be surrounded by four island-continents. The southernmost island is called Jambudvīpa.
Gondwana fragmented as these continents drifted apart at different velocities; [9] a process which led to the opening of the Indian Ocean. [10] In the late Cretaceous approximately , and subsequent to the splitting from Gondwana of conjoined Madagascar and India, the Indian plate split from Madagascar and formed Insular India.
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.
An island can also be entirely oceanic while still being associated with a continent by geology (e.g. Bermuda, the Australian Indian Ocean Territories) or by common geopolitical convention (e.g. Ascension Island, the South Sandwich Islands). Another example is the grouping into Oceania of the Pacific Islands with Australia and Zealandia.
The second major phase in the break-up of Pangaea began in the Early Cretaceous (150–140 Ma), when Gondwana separated into multiple continents (Africa, South America, India, Antarctica, and Australia). The subduction at Tethyan Trench probably caused Africa, India and Australia to move northward, causing the opening of a "South Indian Ocean".
The granite outcrops of the Seychelles Islands in the central Indian Ocean were amongst the earliest examples cited by Alfred Wegener as evidence for his continental drift theory. [1] Ridge–plume interactions have been responsible for separating a thinned continental sliver from a large continent (i.e. India).