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- Usage in publication:
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- Churchs Ferry Formation
- Modifications:
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- Named
- Dominant lithology:
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- Shale
- Sand
- AAPG geologic province:
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- Williston basin
Summary:
Named as a formation (1 of 5) in Coleharbor Group; named for village of Churchs Ferry, western Ramsey Co, ND, Williston basin. Type area designated in eastern and southern Ramsey Co; type section is in NW1/4 NW1/4 NW1/4 sec 3, T155N, R66W, Ramsey Co. Divided into three members--lower, middle and upper--which occur in Ramsey Co. These divisions based on shale abundance in the three members; lower member includes shale breccia and shaly till having 37-60 percent shale; middle member ranges from 23-26 percent shale; upper member is very sandy, ranging from 9-19 percent shale. Formation consists generally of shale in a very coarse sand fraction. Lower member probably deposited after considerable period of erosion and weathering. Upper member is very sandy and light colored. [No other lithologic description or discussion of lithologic sequence within the members.] Thickness not given. Stratigraphically above Camp Grafton Formation (new) of Coleharbor Group; stratigraphically below, depending on location, either Dahlen Formation or Gardar Formation, both of Coleharbor Group. Geologic maps. Cross section. Of Pleistocene age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
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