translation.en: In the same valley there are modern human remains from about the same date, 30,000 years ago, and some of those are from local chert, but more -- but many of them are made from obsidian from a long way away.
translation.zh: 在这同样的山谷，大约在3万年前同一日期， 那有现代人类遗址。 现代人的一些燧石是当地制成的， 但更多，多数是 从很远的地方的黑曜石制成的。