1 gen 75000 anni a. C. - Adam's Calendar
Descrizione:
some theories:
rock formation as a calendaring system
estimated to be 75000 years old
https://en.wikipedia.org/wiki/Blaauboschkraal_stone_ruins
http://realhistoryww.com/world_history/ancient/Misc/Adams_Calendar/Adams_Calendar.htm
Aggiunto al nastro di tempo:
Data:
1 gen 75000 anni a. C.
Adesso
~ 77075 years ago