Natalie J. Nicholson
Layers of Time
The road cut near Eugene, Oregon shows brightly colored layers of dry rock.
However, these rocks were actually formed under water.
30 million years ago a river emptied into a lake just south of Eugene. It carried sediment, or little pieces of rock. As the current slowed it left the sediment behind, first dropping the heavier grains and slowly leaving the finer pieces. Today you can see the different beds of tan sandstone and dark shale that remain. Each layer is evidence of different time periods of the past.
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