The Japan Times, October 3, 1997
Stone knives date back 25,000 years
KOBE (Kyodo) Two stone knives believed to be between 24,000 and 25,000 years old that were produced in large numbers in a style particular to western Japan have been discovered in Hyogo Prefecture, a local education board said Thursday.
The tools, found at the Nanukaichi Ruins in Kasuga, indicate that production techniques were established four to five millennia earlier than previously thought, experts said.
Two complete "Ko-style" knives were found below a layer of volcanic ash, education board officials said.