Big picture. A new model of the Amazon predicts that terra preta is more likely to be found along rivers in the eastern part of the rainforest. The letters indicate known archaeological sites.
Ping
http://en.wikipedia.org/wiki/Francisco_de_Orellana
Read Buddy Levy’s bio of Francisco.
He found out the hard way that the Amazon river was full of cultures all the way to the sea.
I am fascinated by ancient cultures all over the world. How and why did so many build the same type buildings? What connection did they have? Why did so many build pyramids? Who did the huge figures in South America? It is amazing.