So those segments are the oldest archaeological layers of the book. (bookbrowse.com)
The Châtelperronian industry follows the Mousterian in archaeological layers at all sites where both occur. (sciencedaily.com)
The beads were found at Blombos Cave in South Africa in archaeological layers dated between 75,000 and 72,000 years ago, during a time period marked by four distinct layers of artifacts called the Still Bay tradition. (sciencemag.org)