Low amplitude obliquity changes during the early Pliocene reflected in diatom fragmentation patterns in the ANDRILL AND-1B core

► Data collected on the size and number of fragments from the diatom genus, Rouxia. ► Formula created to characterize fragmentation in a sample with a single number. ► Fragmentation in subunit III shows evidence of Milankovitch pacing. ► Concentrated sand intervals disrupt the relationship in the upper 20 m. ► Hemipelagic mud produces a cushioning effect, thereby reducing fragmentation.