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

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Thin laminations of ancient sand dunes of the Lyons. If you look closely with a hand lens, you can see the wind deposited sands in each of the thin sheets with small grains at the bottom of each and larger grains at top (very fine up to medium at top of lamination).
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Thin laminations of ancient sand dunes of the Lyons. If you look closely with a hand lens, you can see the wind deposited sands in each of the thin sheets with small grains at the bottom of each and larger grains at top (very fine up to medium at top of lamination).