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Depositional style of the middle Eocene Bridger Formation on the south flank of the Wind River Range, Wyoming, changed in response to volcanism to the north in the Absaroka volcanic field. Lower Bridger sediments were deposited in a fluvio-deltaic environment during the waning stage of Lake Gosiute. Channel lag sediments, trough crossbedding and well developed epsilon crossbed-ding indicate a high sinuosity (meandering) stream pattern. In contrast, upper Bridger sandy channels are simple to multistory ribbons composed dominantly of trough cross-strata. Tuffs and tuffaceous siltstones form channel fills and overbank deposits and constitute a major portion of the unit. Upper...

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