Stratigraphy

Start Depth
End Depth
Stratigraphic Unit
Start Depth: 0.00 ft
End Depth: 210.00 ft
Unit: Pleistocene Series 
System
Quaternary 
Series
Pleistocene Series 
Group
 
Formation
 
Member
 
Submember
 
Start Depth
0.00 ft
End Depth
210.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Till 
Percent
100 
Secondary Lithology
 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 210.00 ft
End Depth: 350.00 ft
Unit: Cretaceous 
System
Cretaceous 
Series
 
Group
 
Formation
 
Member
 
Submember
 
Start Depth
210.00 ft
End Depth
350.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Bedrock Surface - Complete Penetration, No Gaps 
Primary Lithology
Shale 
Percent
Secondary Lithology
Siltstone 
Percent
Tertiary Lithology
Sandstone 
Percent
Comments
Start Depth: 350.00 ft
End Depth: 695.00 ft
Unit: Dakota 
System
Cretaceous 
Series
 
Group
Fort Benton ("Lower Colorado ") 
Formation
Dakota 
Member
 
Submember
 
Start Depth
350.00 ft
End Depth
695.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Sandstone 
Percent
Secondary Lithology
Shale 
Percent
Tertiary Lithology
Coal 
Percent
Comments
Start Depth: 695.00 ft
End Depth: 753.00 ft
Unit: Decorah 
System
Ordovician 
Series
 
Group
Galena 
Formation
Decorah 
Member
 
Submember
 
Start Depth
695.00 ft
End Depth
753.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Sandstone 
Percent
Secondary Lithology
Dolomite 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 753.00 ft
End Depth: 802.00 ft
Unit: Platteville 
System
Ordovician 
Series
 
Group
Galena 
Formation
Platteville 
Member
 
Submember
 
Start Depth
753.00 ft
End Depth
802.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Shale 
Percent
100 
Secondary Lithology
 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 802.00 ft
End Depth: 825.00 ft
Unit: St. Peter Sandstone 
System
Ordovician 
Series
 
Group
Ancell 
Formation
St. Peter Sandstone 
Member
 
Submember
 
Start Depth
802.00 ft
End Depth
825.00 ft
Contact Accuracy
Base Accurate, Top Less Accurate - (Indistinct Lithologic Contact) 
Penetration
Partial Penetration (Base Not Met), No Gap At Top 
Primary Lithology
Sandstone 
Percent
100 
Secondary Lithology
 
Percent
Tertiary Lithology
 
Percent
Comments