Fig. 5: Simulated North American ice sheet distribution.
From: Astronomical forcing shaped the timing of early Pleistocene glacial cycles

Simulated North American ice sheet distribution for each glacial maximum for a a typical glacial maximum (MIS 42) and b a large glacial maximum (MIS 48) under a constant pCO2 (230 ppm), and c Last Glacial Maximum (LGM, 21 ka) with realistic variations in atmospheric CO283.