== Human history == 

 While this is rightly a broadly geologic outline rather than an anthropological one, I wanted to suggest three things to slightly fill out the last six or seven points . 
 *Moving the beginning of recorded history back 1200 years to keep it in-line with the invention of writing in Sumeria (3200 B.C.). 
 *Mention the industrial revolution, one of the "big two" revolutions alongside agricultural. 
 *Mention nuclear weapons and the possibility of our destroying all higher lifeforms. Sensible?