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April 3, 2013

#1194: Stratigraphic Record

Stratigraphic Record

[[A view of the Earth from space.]]

Nearly 4.5 billion years ago, Earth had liquid water. But all the crust older than 3.5 billion years has been recycled into the mantle by subduction.

[[The same view.]]

A billion years of the stratigraphic record, the memory of the hills, is forever lost to us. What was it


here, four billion years ago?

[[The same view.]]

Earth, what


do you have?

[[The same view.]]

Earth: come closer

[[A closer view.]]

[[An even closer view.]]


i’ll never tell.