The cliff-making layer at the top is the Bighorn dolomite. It is underlain here by Cambrian shale and limestone and pre-Cambrian
![Reports]. DOERUN FORMATION. 47 DOERUN FORMATION. Resting conformably above the Derby formation is an horizonwhich consists chiefly of argillaceous dolomite. It appears to bea partial return to the oceanic conditions prevailing Reports]. DOERUN FORMATION. 47 DOERUN FORMATION. Resting conformably above the Derby formation is an horizonwhich consists chiefly of argillaceous dolomite. It appears to bea partial return to the oceanic conditions prevailing](https://c8.alamy.com/comp/2AFP9YF/reports-doerun-formation-47-doerun-formation-resting-conformably-above-the-derby-formation-is-an-horizonwhich-consists-chiefly-of-argillaceous-dolomite-it-appears-to-bea-partial-return-to-the-oceanic-conditions-prevailing-over-this-regionduring-the-time-of-the-deposition-of-the-sediments-of-the-davisformation-however-there-is-no-limestone-in-this-formation-andthe-dolomite-is-not-even-calcareous-the-formation-consists-ofalternating-beds-of-argillaceous-dolomite-finely-crystalline-densedolomite-and-soft-finely-porous-dolomite-the-name-doerun-isfrom-the-doe-run-lead-company-which-ow-2AFP9YF.jpg)
Reports]. DOERUN FORMATION. 47 DOERUN FORMATION. Resting conformably above the Derby formation is an horizonwhich consists chiefly of argillaceous dolomite. It appears to bea partial return to the oceanic conditions prevailing
![The Sassongher In Autumn From Corvara. Val Gardena, Dolomites, Trentino Alto Adige, Italy Stock Image - Image of italy, dolomite: 181032833 The Sassongher In Autumn From Corvara. Val Gardena, Dolomites, Trentino Alto Adige, Italy Stock Image - Image of italy, dolomite: 181032833](https://thumbs.dreamstime.com/z/sassongher-autumn-corvara-val-gardena-dolomites-trentino-alto-adige-italy-181032833.jpg)