These are the well- known flints of the Upper Chalk. We notice how they occur here in more or less parallel lines, following the stratification of the chalk. Also that they are some three or four ...

A genetic link between Northern Flints and 1,000-year-old Ozark maize By reconstructing the genomes of archaeological maize cobs and kernels, the study reveals that 1,000-year-old maize from ...