Some articles on hesperian:
... The lower boundary of the Hesperian System is defined as the base of the ridged plains, which are typified by Hesperia Planum and cover about a third of the planet’s surface ... The Hesperian’s upper boundary is more complex and has been redefined several times based on increasingly detailed geologic mapping ... Currently, the stratigraphic boundary of the Hesperian with the younger Amazonian System is defined as the base of the Vastitas Borealis Formation (pictured right) ...
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