R_Facies

The type of geologic facies.

R_Fault

Reference entity that contains the valid fault classifications. Examples are normal, antithetic, reverse, strike-slip, thrust, radial and concentric.

R_Geochronology

Reference entity that names a span of continuous time in geologic history. A geochronologic unit refers to the time. A chronostratigraphic unit refers to rock. They may have the same name For example, the Cretaceous Period (Geochronology) is the time unit for the deposition of rocks of the Cretaceous System (Chronostratigraphy).

R_Geologic_Layer

Reference entity that provides an approved or standard name for 3-D geologic layers and facies. This includes standard lithostratigraphic names for formations and members.

R_Geologic_Surface

Reference entity that provides an approved or standardized name for geologic feature boundaries.

R_Reservoir_Drive_Mech

Reference entity that contains the valid reservoir drive mechanisms. Examples are dissolved-gas drive, gas-cap drive, and water drive.

R_Rock_Fluid_Feature

Reference entity that provides an approved or standardized name for reservoirs and aquifers.

R_Strat_Surface

Reference entity that contains the valid stratigraphic boundary classifications. Examples are Angular Unconformity, Diastem, Disconformity and Nonconformity for Unconformity surfaces and Chronostrat Contact, Lithostrat Contact, Biostrat Contact, and Facies Contact for conformable surfaces.

R_Stratigraphic_Rank

The layer position in the stratigraphic hierarchy. A standard example from the Code of Stratigraphic Nomenclature is, Group, Formation, Member, and Bed as the units for Lithostratigraphic layers.