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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 50 (1966)

Issue: 10. (October)

First Page: 2260

Last Page: 2268

Title: Reef Trends of Mississippian Ratcliffe Zone, Northeast Montana and Northwest North Dakota

Author(s): Alan R. Hansen (2)

Abstract:

Algal pelletoid reef deposits comprise the main oil-productive lithologic type in the Mississippian Ratcliffe zone of the Charles Formation, northeast Montana and northwest North Dakota. These rocks were formed in a moderate- to high-energy environment near the central part of the Williston basin.

The reef deposits appear to have formed in slightly shallower parts of the shallow Ratcliffe sea. These low-relief submarine highs were controlled partly by relatively small movements along fault trends and lines of structural weakness that were active intermittently during Paleozoic time.

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