What eon has very little evidence left on the planet?
Hadean
Is there any official subdivision?
no
What time period did it predate?
Archean.
When did that time period start?
about 4.6 billion years ago
With what event?
the formation of the Earth
When did it end?
4 billion years ago.
Who named the time period?
Preston Cloud
When?
1972,
What did W. Brian Harland later call the time period?
Priscoan period
And the earliest name for it?
Pre-Archean.
Pertaining to it's Greek meaning, what does Hadean describe?
the hellish conditions
Was part of those hellish conditions due to the planet being super hot?
yes
How about lots of temporary radioactive stuff?
yest
And getting crashed into by other planetary stuff?
no
When was an alternative scale introduced?
In 2010,
Did it add two eons before the Hadean?
yes
What were they?
the Chaotian and Prenephelean
How many eras did the new scale apply to Hadean?
Three
Each consisting of what?
2 periods each.
Has the new scale and changes been accepted by the IUGS?
no