Circle Ridge 

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Dinwoody Formation

The basal Triassic unit is the Dinwoody Formation. The contact between the Dinwoody Formation and the Phosphoria Formation appears continuous and conformable as it crops out in the central hill of Circle Ridge. The Dinwoody is composed of silts and sandy, anhydritic shale with a few interbedded gray dolomites and limestone. It has a unique white to yellow color. The 140-foot-thick Dinwoody Formation was deposited in semi-restricted marine or supratidal environment (Kinsman, 1969).

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 Last updated: June 26, 2001

Golder Associates 2000-2002