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This data file contains the cosmogenic beryllium-10 (10Be), aluminum-26 (26Al), and chlorine-36 (36Cl) data from the frozen sediments underneath the Camp Century ice, produced at the Cosmogenic Nuclide Laboratory of the Lamont-Doherty Earth Observatory within National Science Foundation (NSF) Award 2114634 ('Collaborative Research: A fossil ecosystem under the ice: deciphering the glacialand vegetation history of northwest Greenland using long-lost Camp Century basal sediment'). These data help understanding the complexity of the 3 meters (m) of frozen sediment underneath the Camp Century ice core, and adds constraints to the question of past stability of this sector of the Greenland Ice Sheet. We have processed relatively small sub-samples we received from the University of Vermont team (lead PI Paul Bierman), by separating and de-contaminating quartz and feldspar, and measuring the cosmogenic isotopes listed above down the frozen sediment column. These important and complex data are currently prepared for publication under the lead of Lamont postdoc Joanna Charton.