Distinct breaks between the A. Palmata reef-framework demonstrate that there were three (3) distinct sea level rise events during the last deglaciaion.
(1) Catastrophic Rise Event-1 (CRE-1) started at ~12200 BCE (+/- 100) and had a magnitude of 13.5 (+/- 2.5) meters.
(2) CRE-2 started at ~9500 BCE (+/- 100) and had a magnitude of 7.5 (+/- 2.5) meters.
(3) CRE-3 started at ~5600 BCE (+/-100) years and had a magnitude of 6.5 (+/-2.5) meters.
The exact duration of CRE is unknown but based on minimum rate of sea-level rise (>45 mm/yr), the duration of CRE-1 must have been <290 (+/-50) years, the duration of CRE-2 must have been <160(+/-50) years and CRE-3 must have been <140 (+/-50) years.
Note down the timing of CRE-1 (my proposed timing for the Rama-Ravana War – 12209 BCE) and the timing of CRE-3 (my proposed timing for the flooding of Krishna’s Dwarka – 5525 BCE).
While CRE-3 provides very strong and independent corroboration (independent of astronomy and literal evidence, i.e. of Mahabharata text)……..CRE-1 only deepens the mystery of 'Nala-setu' that was built by Vanara-Nala for Rama/Vanara army to cross the ocean from India to Lanka.
Reference: "Reef drowning during the last deglaciaion: Evidence for catastrophic sea-level rise and ice-sheet collapse", Paul Blanchon & John Shaw (from the world famous, University of Alberta, Edmonton, Canada), Geology, January 1995, vol 23, #1, Pages 4-8.