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

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Top of the Fountain formation. Well sorted, finely grained, formed by wind blowing sands and creating dune fields. There are alternating layers in the last 30 meters of the Fountain formation caused by alternating wind and water making dune, river, dune, river. Looking closely at these rocks, you can see thin horizontal "sand sheets" which are at the margins of the sand dunes.
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Top of the Fountain formation. Well sorted, finely grained, formed by wind blowing sands and creating dune fields. There are alternating layers in the last 30 meters of the Fountain formation caused by alternating wind and water making dune, river, dune, river. Looking closely at these rocks, you can see thin horizontal "sand sheets" which are at the margins of the sand dunes.