* I have found one updated research on Yayoi

The migrations in Yayoi period happened way before there was any nation-state in Korea peninsula.And now,the re-evaluations of carbon 14 had indicated the possibility that maybe Yayoi period began 500 years earlier than previously recognized ( BC 800 ).


It is noteworthy that this is the first time that NMJH has been awarded a Grant-in-Aid for Creative Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology for research on, "The Origin of the Farming in the Yayoi Period and East Asia: Establishment of High-Precision Chronology by Carbon 14 Age Analysis", the NMJH Centers of Excellence grant since 1997

" The Origin of the Farming in the Yayoi Period and East Asia: Establishment of High-Precision Chronology by Carbon 14 Age Analysis" (2004-2008) (General Organizer: NISHIMOTO Toyohiro)

NMJH has been conducting studies on the application of high-precision C14 dating techniques with the use of Accelerator Mass Spectrometry (AMS).This research was approved in order to confirm preliminary results that the Yayoi period had started in the 10th century BCE, or 500 years earlier than previous archaeological theories have proposed. At the end of 2003, NMJH established a research facility to create a framework for C14 dating experiments. With the award of the grant, the group decided to conduct nation-wide research on age determination, primarily of Yayoi period remains.

In the 2004 fiscal year, more than 2,000 samples of wood, seeds, and carbide residue on earthen vessels were extracted from 190 sites; among them, measurements were conducted on 500 samples. As a result, we speculate that irrigated rice cultivation of the Yayoi cultures first appeared in northern Kyushu approximately 930 BCE and that the "early Yayoi" period began around 800 BCE. We also tentatively concluded that "early Yayoi" culture appeared in the Chugoku and Kinai areas between 700 and 600 BCE, 100 to 200 years later than northern Kyushu. We are also beginning to get a clear picture of ocean reservoir effects and millet.

English Source: http://www.rekihaku.ac.jp/e_kenkyuu/report2004.html

Natl Museum of Japanese History: http://www.rekihaku.ac.jp/english/index.html