High-resolution seismic-reflection profiles obtained between Chesapeake Bay and Long Island along 2,500 km of trackline appear to show tilting of a large lithospheric block within the United States eastern continental margin. This warping probably was related to glacial loading and unloading. It has resulted in postglacial changes in depth at locations where radiocarbon-dated samples have been obtained and thus has affected the eustatic sea-level curves deduced from these samples. Corrected values indicate significantly shallower depths in the older (deeper) parts of the United States east coast curve and thus a revised estimate of global sea-level lowering during Wisconsinan time.

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