SASKATCHEWAN, CANADA—CBC News reports that two bone samples found in separate pits under a sandstone cliff carved with petroglyphs in southern Saskatchewan have been radiocarbon dated. The first bone sample was dated to A.D. 900, while the second was dated to 120 B.C. “It doesn’t date the carvings directly, but it’s very suggestive that people were using this particular site, maybe making carvings, as far back as 2,100 years ago,” said archaeolo…