Marine limestone and sandstone tongues extend southeastward from the Phosphoria and the Dinwoody formations of the Wind River Mountains and the Owl Creek Mountains, interfingering with the red shales in the base of the Chugwater formation in central and southeastern Wyoming. The intercalated marine beds and red shales constitute the red-bed “Embar” of central Wyoming. The nature of the lateral change from the Phosphoria and the Dinwoody facies to the red-bed Chugwater facies is described.

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