Descriptions - Travers 22-24, sec. 24, T22N, R5E, Harding Co., SD, Red River D Zone
Reported Core Interval 9070-9130
Adjusted Core Interval 9076-9136
9070-9075 - Brown, burrowed and slightly dolomitic, skeletal lime mudstone to lime wackestone. Burrow structures are dominantly circular, subhorizontal Planolites with less common branching Thalassinoides. Skeletal fragments are small crinoids. Occluding cement is calcite.
9075-9077 - Gray, skeletal lime mudstone to wackestone. Skeletal fragments are dominated by small crinoids. Stylolitization is common, and there is no visible porosity or oil staining.
9077-9114 - Brown to gray, dolomitic lime mudstone to lime wackestone at the top of the unit and dolomudstone and dolowackestone at center and base. Porosity is best developed within dolomitized intervals. Burrow structures are preferentially dolomitized throughout. Skeletal fragments are crinoids and sparse brachiopods. Oil staining is poor to fair.
9114-9115 - Gray, skeletal lime mudstone to wackestone. Skeletal fragments are dominated by small crinoids. Stylolitization is common, and there is no visible porosity or oil staining.
9115-9122 - Brown, burrowed and dolomitic, skeletal lime mudstone to lime wackestone, Burrow structures are dominantly branching Thalassinoides and less common circular, subhorizontal Planolites. Occluding cement is finely disseminated anhydrite.
9122-9125 - Gray, skeletal lime mudstone to wackestone. Skeletal fragments are dominated by small crinoids. At the top of the unit, thin lime mudstone and shale beds (Kerogenites) are present. Stylolitization is common, and there is no visible porosity or oil staining.
9126-9130 - Brown, burrowed and dolomitic, skeletal lime mudstone to lime wackestone. Burrow structures are dominantly circular, subhorizontal Planolites with less common branching Thalassinoides. Occluding cement is finely disseminated anhydrite. Oil staining is good within the better dolomitized intervals.