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Today’s sketchbook:

KNM-ER 1802 mandible, occlusal view

KNM-ER 1802 mandible, in occlusal view. This mandible is attributed to the genus Homo, often placed in Homo habilis, although those who believe in Homo rudolfensis generally include this mandible. From the Upper Burji Member of the Koobi Fora Formation, it dates to around 1.9 million years ago.