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Depositional Environments Of The Lower Tullock Formation (Paleocene), Slope County, Southwestern North Dakota, William K. Hickey
Depositional Environments Of The Lower Tullock Formation (Paleocene), Slope County, Southwestern North Dakota, William K. Hickey
Theses and Dissertations
The lower Tullock Formation (Paleocene), which consists of a section 5 to 30 feet thick, was studied in Slope County, southwestern North Dakota to determine its depositional environments. The lithol ogies present are sand, silt, clay and lignite. A bed of lignite or yellow silt marks the base of the Tullock Formation throughout the study area.
The silt beds are interpreted as having been deposited as natural levees because they are wedge-shaped and contain climbing ripple cross-stratification, interbedded sand lenses and lignitized paleo-raot systems. Well-drained swamp deposits are difficult to distinguish, but are probably located in the silt beds.
There …