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Hesperian


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A division of areological time, lasting from 3.50 Gy to 1.80 Gy in the Hartmann–Tanaka Model and 3.80 Gy to 3.55 Gy in the Neukum–Wise Model, and divided into two epochs: Lower Hesperian (3.50–3.10 or 3.80–3.70 Gy); and Upper Hesperian (3.10–1.80 or 3.70–3.55 Gy).

Subjects: Earth Sciences and Geography.


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