Dating coins and stalks

[remod]

I'm trying to nail down the (of course, approximate) date of documented use of the three coins for casting I Ching hexagrams.

 

I know the initial method of using cracks in turtle shells o ox bones is long lost.

I've also read that methods using stalks were in use for a long time but their details are lost as well and the yarrow stalks method we currently use is a reconstruction dating the XIII century.

 

I seem to remember that usage of the three coins is documented to exist around the VIII century.

 

My problem is that I have no source for all this
I've read a lot of articles and books along the years but I didn't keep track of what was in which book and how reliable it was.

 

I'm pretty sure my memory is right but we all know that our minds can play nasty tricks on us and having a more solid foundation is much much better.

 

Does anyone know of authoritative sources that can be cited to support (or deny!) what I remember from my readings?

Thanks!

 

Edited August 21, 2022 by remod

[Harmen]

https://www.yjcn.nl/wp/the-oldest-source-for-the-coin-method/

[remod]

Thanks Harmen! I must confess I was hoping you had something on this topic!

 

Thanks!