. [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
. [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 owns the lands uponwhich the type section occurs. The thickness of this formation is variable between quite widelimits, owing to an uneven or perhaps unconformable contact withthe overlying Potosi formation. The repetition of very similar bedsthrough faulting in certain areas may also have been instrumentalin giving to this formation an apparently much greater thicknessthan it actually possesses. The normal thi
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