Three new 14C dates on mollusks from Schuchert Dal, East Greenland, ranging from 8570-8670 B.P. date the maximum marine invasion of Schuchert Dal after the glacial advance of the Milne Land Stadial, which terminated around 9900 B.P. The faunas contain the earliest known occurrence of Chlamys islandica, an indicator of the hypsithermal incursion of warmer waters into Scoresby Sund. C-14 dates previously obtained for this species range from 7870-5680 B.P. (uncorrected ages). The initial rapid rate of isostatic rebound in the valley (4.8 m 100 yr-1) is typical of Greenland uplift curves. Formation of open system pingos on the lower slopes occurred after 8580 B.P.