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

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Small raised areas are the result of raindrops hitting the surface of the adjancent sand. Then, this sand layer covered the other sand and filled in the holes, making these inverted (raised) raindrop marks. (This is the bottom surface of the rock)
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Small raised areas are the result of raindrops hitting the surface of the adjancent sand. Then, this sand layer covered the other sand and filled in the holes, making these inverted (raised) raindrop marks. (This is the bottom surface of the rock)



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