There's a comment from the article's author here: https://news.ycombinator.com/item?id=14327802 https://news.ycombinator.com/item?id=14327802 The data is thoug

There's a comment from the article's author here: https://news.ycombinator.com/item?id=14327802 https://news.ycombinator.com/item?id=14327802 The data is thought to be pretty accurate (±5M years) and it's from radiometric dating of the oil sands.