India
and Meganesia, comprised of Australia, New Guinea, Tasmania, New
Zealand, and New Caledonia, are fragments of the once existing
supercontinent called Gondwana. Seafloor-spreading separated these land
masses from one another, but as the spreading centers became inactive,
they fused again into a single plate. So in the region of question there
exist two sunken continents: Zealandia at the western edge of the
Pacific and the Kerguelen plateau in the Indian Ocean. There is also
another significant plateau near the Rodrigues triple point, where the
mantle’s thickness is double the average (roughly 20 km), although
nowadays there is no known geologic formation under the Indian or
Pacific Oceans that corresponds to the hypothetical Lemuria. However,
drilling carried out in 1999 from a research vessel discovered that the
Kerguelen plateau was submerged about 20 million years ago due to rising
sea levels. Samples of a 90 million-year-old sediment, collected from
the seabed, revealed the existence of pollen and fragments of wood.
The
Kerguelen plateau (continent), which presently is submerged 1 to 2 km
below sea level, was formed beginning with volcanic eruptions 110
million years ago. Its size might have been even bigger than it is now,
since the Broken Ridge underwater volcanic plateau, located west of
Australia, was contiguous with it. Geologic evidence presented layers of
soil and charcoal, which prove that this was dry land with flora and
fauna. Its sedimentary rocks are similar to the Australian and Indian
ones, suggesting they were once connected, possibly forming Lemuria.
Zealandia
or Tasmantis, with its 3.5 million square km territory being larger
than Greenland, is another nearly submerged continent, with New Zealand
being its most notable remnant. It broke away from Gondwana, then from
Antarctica, and lately from Australia and became almost completely
submerged (93 percent) about 23 million years ago.
An
interesting huge geologic formation in the Pacific is the approximately 2
million square km volcanic basaltic Ontong Java Plateau near the
Solomon Islands, located close to the Antarctic-Pacific ridge by the
Louisville hotspot, formed by a mantle plume, which is a lifting of hot
rock from the Earth’s mantle. This resulted in the 4,300-km long
Louisville underwater chain of over 70 seamounts in the southwest
Pacific, stretching to the Indo-Australian plate, and specifically to
New Zealand, and which may be connected with other ridges reaching the
eastern islands of the Pacific.
The Indo-Australian
plate may have been connected to the African plate and the Antarctic
plate, forming one plate that could host the Kerguelen continent or
similar formations in the past. The theory of plate tectonics states
that Madagascar and India were parts of the same continent, and if we
accept the Lemurian timeline we may conclude that early humanoids may
have lived on this former continent, sharing the same genetic heritage,
although the land itself has now drifted apart.
The
clusters of islands filling the Indian Ocean between Madagascar and
India remain as possible geologic evidences. The Mascarene Islands east
of Madagascar have a common volcanic origin and form a distinct
ecoregion, comprising the Mauritius, Reunion, Rodrigues islands, the
Cargados Carajos shoals, and the banks or former islands of Saya da
Malha, Nazareth, and Soudan. The Mascarene plateau, with an area of over
115,000 square km extending from the Seychelles to Reunion, is another
evidence for the submerged Lemurian continent, as it has very shallow
waters, having depths varying between a mere 8 meters to 150 meters. The
plateau presents banks consisted of former coral reefs, some of which
might have been islands in the geologic near past, when sea levels were
even 130 meters lower than today.
The Saya de Malha
bank (in English mesh skirt) is a very shallow bank of 40,808 square km,
lying southeast of the Seychelles, which reveals that the whole was
above water during the Ice Age. The bank is so proper that it was the
site of an attempt to create an artificial island by creating seacrete
and biorock. The other bank—Nazareth—has an area of about 11,000 square
km (according to some sources, this varies between 7,625 and 26,000
square km). Other remnants of Lemuria may be the islands of Seychelles,
Reunion, Zanzibar, Mauritius, and Chagos. Reunion, Comoros, and Mayotte
are closer to Africa, while Chagos is in the middle of the ocean,
halfway from Tanzania to Java.
Seychelles is an
archipelago nation of 115 islands in the Indian Ocean, altogether a mere
451 square km, located 1,500 km (930 miles) east of mainland Africa,
northeast of the island of Madagascar. The main islands—the inner
ones—are located on a shallow bank called Seychelles bank or Seychelles
plateau, while the outer islands are situated at 230–1,150 km from the
main island Mahe. The inner, central group are composed of 42 granitic
islands called the Granitic Seychelles, which form the northernmost part
of the Mascarene plateau, all being fragments of the ancient
supercontinent Gondwana and thought to have been separated from other
continents 75 million years ago. The Outer Islands comprising 46 percent
are the Coralline Seychelles, five island groups made up of low-lying
coral islands with dry, infertile soils. The fifth, the Amirantes
Island, stretches at a distance of about 155 km, all on the shallow
Amirantes bank/plateau, with depths varying between mostly 25 to 70
meters.
The Chagos group consists of 60 islands and
seven atolls, having an area of around 15,000 square km, of which 12,642
square km form the Great Chagos bank, including lagoons. The Pitt bank,
with almost 56 km in length and a width between 20 and 30 km, of an
area of 1,317 square km and depth varying between 7 and 44 meters, makes
the third largest atoll structure in the world.
The
Maldives encompass 1,192 islets and 250 islands, being the lowest lying
country with a maximum natural ground level of only 2.3 meters above sea
level. This must have been much bigger in the period of glaciations, so
this may be a reference to the classical Sanskrit texts dating back to
the Vedic times mentioning the ‘‘Hundred Thousand Islands’’
(Lakshadweepa). This generic name, which would include not only the
Maldives but also the Laccadives and the Chagos groups, is evidence that
it was known and inhabited since ancient times, very possibly before
the presumed sinking of Lemuria in 16,000 BCE, and it has been made part
of it.
Lakshadweep or Laccadives/Minicoy/Amindivi
Islands (the ‘‘hundred thousand islands’’) are located between Arabia
and India. It officially consists of about 36 islands and islets
covering in total 28 square km, but it also comprises 12 atolls, three
reefs, and five submerged banks. Two banks farther north are not
considered part of the group—the Angria and the Adas banks—but they have
considerable size. Angria bank is a big, shallow, sunken coral atoll on
the continental shelf, off the west coast of India, 40 km long by 15 km
wide, with a minimum depth of 20.1 meters. Between Angria and the
Laccadives lies the Adas bank, with 70 meters at its shallowest point,
but all these could have been islands during the last Ice Age, with even
more uplift in the previous ages, subsequently of much bigger size when
Lemuria presumably existed.
Although current plate
distribution may suggest the opposite, the flora and fauna of a portion
of land on one plate may be the same as that of the adjacent land
belonging to another plate. A good example is the northern boundary of
the Indo-Australian plate with the Eurasian plate, which form the
Himalaya and Hindu Kush. Its subducting boundary crosses the ocean from
Bangladesh to Burma, Sumatra, and Borneo and is not parallel with the
so-called Wallace line, which is the biogeographic boundary between the
Asian and Australian indigenous faunas. That is also the case for
Madagascar and India; although separated now, they preserved their
original fauna or part of it in fossils, which is another indirect
evidence for the possible existence of Lemuria.