Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #5: Lykins, Canyon Spring, Morrison, Dakota Formations

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Dakota Formation - Lower section is river deposits, then comes coastal beaches, then marine shales. The Dakota has two sequences of the ocean moving in and back out again... the ocean came in and out twice, then came in to stay. This image shows gray marine shales surrounded by two intervals of sandy, near shore sandstone deposits.
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Dakota Formation - Lower section is river deposits, then comes coastal beaches, then marine shales. The Dakota has two sequences of the ocean moving in and back out again... the ocean came in and out twice, then came in to stay. This image shows gray marine shales surrounded by two intervals of sandy, near shore sandstone deposits.