Descriptions - Travers Ranch 1-6, sec 6, T22N, R5E, Harding Co., SD, Red River D Zone
Reported Core Interval 8957-9022
Adjusted Core Interval 8951-9016
8957-8962 - Brown, burrowed and slightly dolomitic, skeletal lime mudstone to lime wackestone. Burrow structures are dominantly small circular and subhorizontal Planolites. Occluding cement is finely disseminated anhydrite.
8962-8965 - Gray to black, skeletal lime wackestone with thin black shale interbeds near the top of the unit ("Keragonites"). Skeletal fragments are dominated by open marine fauna, mostly small crinoids and lesser amounts of brachiopods, bryozoans, and solitary corals. There is no visible porosity or oil staining.
8965-9006 - Brown to gray, dolomudstone, dolowackestone, and lime mudstone to lime wackestone at the base of the unit. This thick unit contains well-preserved Thalassinoides and Planolites burrowed intervals. Porosity is good and exists in both burrow structures and surrounding mud matrix. Oil staining is spotty at the top and base of the unit, but very good in the middle. Core pieces are missing from 8988-8992, but analytical data indicate similar lithofacies. Occluding cements are calcite and sparse anhydrite.
9006-9001 - Gray to black, skeletal lime wackestone with thin black shale interbeds throughout the unit. Skeletal fragments are dominated by open marine fauna, mostly small crinoids and brachiopods. Stylolites are common and there is no visible porosity or oil staining.
9011-9015 - Brown, sparsely skeletal dolomudstone to dolowackestone. Porosity is well developed within burrow structures and surrounding matrix. Good oil staining.
9015-9017.5 - Gray to black, skeletal lime wackestone with thin black shale interbeds near the top of the unit. Skeletal fragments are dominated by open marine fauna, mostly small crinoids and brachiopods. Stylolites are common and there is no visible porosity or oil staining.
9017.5-9022 - Brown, burrowed and slightly dolomitic, skeletal lime mudstone to lime wackestone. Burrow structures are dominantly branching Thalassinoides with less common, small, circular and subhorizontal Planolites. Occluding cement is finely disseminated anhydrite.