Scientists have found sea levels on India’s eastern coast were still 1-1.5 m higher than today as recently as 500 to 300 years ago and 3-4 m higher than today between 6000 to 4000 years ago. Seas rose and fell by multiple meters (-5 m to +3 m) within 1250 years until as recently as 4000 to 2000 years ago.
A new paper (Loveson and Nigam, 2019) reveals sea levels were still rising at a rate of 2.2 meters per century between 8100 and 7200 years ago, reaching a highstand of 4 meters above today’s sea level 6050 years ago.
For the next several millennia sea levels rapidly rose and fell within a range 6 meters – between 4 meters above to -2 meters below present levels.
A drop in sea level at one point reached an amplitude of -5 meters in just 1250 years (4350 to 3100 years ago) followed by 3 meters of sea level rise within 1200 years (3100 to 1900 years ago).
As recently as about 300 years ago mean sea level on India’s eastern shore was still about 1 meter higher than today.
Image Source: Loveson and Nigam, 2019
Evidence there were sea port towns along India’s west coast that are presently located much further inland suggest sea levels were 2-3 m higher prior to 2500 years ago.
At the time of the 43 AD Roman invasion of Britain, the ocean shoreline, or beach, was located 2 miles (3.22 kilometers) from today’s shore.
Image Source: BBC
A new paper (Makwana et al., 2019) indicates there were sea port settlements that are today located “far inland” compared to where they were about 2500 years ago.
The scientists suggest sea levels may have been at least 2 meters higher than today at that time.
A visual example of how 2-meters-higher sea levels could have “submerged” the coast of western India is provided.