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Trek through Time Plaque, Oligoene

By Youth and Education in Science June 2020 (approx.)
Trek through Time Plaque, Oligocene
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Detailed Description

The Trek Through Time is a short walk through the woods at the USGS National Center in Reston VA. It covers the Phanerozioc - the last 541 million years of Earth history. This is the plaque for the Oligocene. 

Sources/Usage

Public Domain.