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Depositional Environments And Diagenesis Of The Ratcliffe Interval, Madison Group (Mississippian), Williston Basin, North Dakota, Diane M. Catt
Depositional Environments And Diagenesis Of The Ratcliffe Interval, Madison Group (Mississippian), Williston Basin, North Dakota, Diane M. Catt
Theses and Dissertations
The Ratcliffe interval in North Dakota is a log marker-defined unit in the Williston Basin. It is Mississippian in age and crosscuts the lower Charles and upper Mission Canyon Formations of the Madison Group. Study of cross-sections, well core, and thinsections show that the Ratcliffe is comprised of six major facies: 1) brachiopod-bryozoan-echinoderm wackestone/packstone, 2) peloid packstone/wackestone, 3) oolite-peloid packstone, 4) laminated mudstone, 5) quartz siltstone packstone, and 6) anhydrite-dolomite mudstone. These facies were deposited in a regressive setting.
The initial deposition consisted mainly of marine limestones. The environment gradually became more restricted and deposition of large amounts of anhydrite …