Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #1: Fountain Formation

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More alternating banding. Colors are not original - the sands were originally gray. Water intrusion is the source of the iron oxides. The dark red muds have high porostity, but low permeability, meaning the pores aren't connected. Water is absorbed, but it doesn't pass through easily.
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More alternating banding. Colors are not original - the sands were originally gray. Water intrusion is the source of the iron oxides. The dark red muds have high porostity, but low permeability, meaning the pores aren't connected. Water is absorbed, but it doesn't pass through easily.