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

Manitoba Stratigraphic Column

Saskatchewan Stratigraphic Column

Saskatchewan Stratigraphic Column

Local Mirror Link Local Mirror Link Local Mirror Link
Generalized Stratigraphic Correlation Chart

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)