![](http://www.alamy.com/thumbs/6/4A6DEB8B-3D7E-442E-A00D-C5903393F9ED/2ATTF2E.jpg)
Railroad tracks next to the Bighorn River that has eroded the rock layers at Wind River Canyon to expose millions of years worth of geology.
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Photo credit: © Tami Freed / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: basalt, bighorn, blue, brush, canyon, clear, discover, dolomite, environment, erosion, explore, fast, fossil, geological, geology, granite, green, history, limestone, millions, outdoor, passage, period, railroad, rapids, river, road, rock, rural, sandstone, shale, siltstone, sky, study, time, type, volcanic, walls, water, wild, wind, wyoming, years