THE LAST GLACIAL AND DEGLACIATION: INSIGHTS FROM CONTINUOUS CORING ON THE NEW JERSEY CONTINENTAL SHELF
The oldest sediments recovered are present above and below R, a time-transgressive regional unconformity. Estimates for formation of R on the mid-shelf are ~45 Ka, around the MIS3b - MIS3b/a transition at shallow water depths. Sediments deposited at this time were delivered from a paleo-Hudson system to a mid-shelf position, and had a bimodal source (NJ hinterland and the Hudson River drainage basin). As sea level fell within MIS2, sediments were reworked on the shelf, and channels were incised (~30 – 16 Ka). Infilling of the fluvial system occurred rapidly during latest MIS2 (16-14Ka), shortly after the shoreline began to migrate landward. The CHIRP data indicate a reinvigoration of flow around 14 Ka at the time of Meltwater Pulse 1A, although we find no evidence for jökelhlaup deposition associated with the Intra-Allerød cold period ~13 Ka. Fairly homogenous Recent reworked sediments cap the sequence, and have hornblende ages that are consistent with a NJ highlands source region, indicating a greater input by NJ rivers. Our integrated analysis complements previous studies and elucidates significant regional differences in deposition, particularly north of the Hudson Canyon system.