GRONINGEN, THE NETHERLANDS—Phys.org reports that a shell midden dated to between 6,300 and 5,970 years ago has been discovered on Velanai Island in northern Sri Lanka by a team of researchers led by Thilanka Siriwardana of the University of Groningen and his colleagues. It had been previously thought that northern Sri Lanka was not occupied until the arrival of pastoralists from India in the fifth century B.C. because of its limited vegetation, lack of fresh water, and scarce raw materials for making stone tools. Analysis of the shell midden, however, indicates that prehistoric hunter-gatherers on Velanai Island relied heavily on mollusks, but also consumed sea bream, deer, wild boar, dugongs, and dolphins....