Geology
Geology of the Bakken:
EERC beat me to the punch at getting this up. I will probably try to fill in some gaps.
http://www.undeerc.org/bakken/geology.aspx
Stratigraphic Columns of the Williston Basin and Surrounding Region:
| North Dakota | Manitoba | Saskatewan |
|---|---|---|
 MS-91 North Dakota Stratigraphic Column |  Manitoba Stratigraphic Column |  Saskatchewan Stratigraphic Column |
| Local Mirror Link | Local Mirror Link | Local Mirror Link |
Generalized Stratigraphic Correlation Chart: South West Montana, Crazy Mountains Basin, Central Montana, Big horn Basin, South Central Montana, Northern Powder River Basin, Williston Basin, North Central Montana, Sweetgrass Arch, Northern Disturbed Belt. (Please let me know who the original source is if you know this was just a lone picture on a website)
South Dakota Correlation Chart (Nice but not all that useful for the Bakken)
Regarding the SD strat column, two of the columns authors (Dr.s M. Farenbach and JF Sawyer) tell me that the Englewood limestone of lower Mississippian age is in fact the Bakken equivalent in SD. It has shown oil in sample cuttings in several wells drilled immediately after WWII, in areas considered southeastern Williston Basin margins. No drilling has been done in these remote areas of SD since then.
My point is, your readers may be interested that the Bakken (and it’s equivalents) simply do not evaporate on “state line faults”, but can be traced to their individual stratigraphic limits. In SD, we expect that the lower Mississippian exploration currently booming in ND/Canada will eventually be headed this way. Recent discoveries of shallow crude in Cretaceous sediments in Meade County SD will lead the way for this migration. Thanks for your excellent site!