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Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #3: Fountain & Lyons Formations

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The Lyons formation is all sand dunes. It is very finely grained and evenly sorted. The Lyons is still a pinkish color like much of the Fountain, but it is quartz cemented by quartz which gives it a shiny surface.
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The Lyons formation is all sand dunes. It is very finely grained and evenly sorted. The Lyons is still a pinkish color like much of the Fountain, but it is quartz cemented by quartz which gives it a shiny surface.



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