The Mahi and Kothiyakhad are two recently established marine formation
s from the Late Quaternary continental succession of the lower Mahi va
lley, Gujarat. These formations have yielded fairly rich assemblages o
f foraminiferids, confirming their marine origin. The Mahi Formation i
ndicates that the first major transgression of about 7-8 m high took p
lace around 240 Ka in the Mahi valley during Late Quaternary. However,
the second transgressive phase at similar to 4,000 years BP, represen
ted by the Kothiyakhad Formation, is to be viewed in the light of the
tectonic uplift in recent times. Results of radiocarbon dating of bott
om and top mud layers of Kothiyakhad section indicate that the sea-lev
el was high up to 2,000 years BP.