Hadeicum; eon or era?

[Hanneke JM Meijer <hanneke.meijer@gmail.com>]

In case my previous email got truncated:
My 12 year old sister is taking paleontology classes in school (the
earlier the better!), but now she is asking questions that I have
trouble answering..... Her first one was about the Hadeicum; whether
this is an eon or era. I myself thought it was an era, but she showed
me some websites that say it is an eon, and now I am confused too. Can
somebody help me out on this one? Thanks!

Kind regards, Hanneke Meijer

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